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<> Circuits (145)

On-chip antenna: Practical design and characterization considerations

1 min read ·
Atif Shamim, et al., "On-chip antenna: Practical design and characterization considerations." In 2010 14th International Symposium on Antenna Technology and Applied Electromagnetics & the American Electromagnetics Conference, 2010, 1. This paper highlights the challenges of an emergent field, namely, on-chip antenna design. Consistent with the RF System-on-Chip (SoC) concept, co-design strategy for circuits and on-chip antennas is described. A number of design and layout issues, arising from the highly integrated nature of this kind of systems, are discussed. The characterization difficulties

Higher dimensional models of cross-coupled oscillators and application to design

1 min read ·
Ahmed S. Elwakil, et al., "Higher dimensional models of cross-coupled oscillators and application to design." Journal of Circuits, Systems, and Computers 19, (04), 2010, 787. We present four-dimensional and five-dimensional models for classical cross-coupled LC oscillators. Using these models, sinusoidal oscillation condition, frequency and amplitude can be found. Further, undesired behaviors such as relaxation-mode oscillations and latchup can be explained and detected. A simple graphical design procedure is also described.

Millimeter-Wave and Terahertz Technologies-Enhanced Plasma Wave Detection of Terahertz Radiation Using Multiple High Electron-Mobility Transistors Connected in Series

1 min read ·
Tamer Elkhatib et al., "Enhanced Plasma Wave Detection of Terahertz Radiation Using Multiple High Electron-Mobility Transistors Connected in Series," in IEEE Transactions on Microwave Theory and Techniques, vol. 58, (2), 2010, 331 We report on enhanced room-temperature detection of terahertz radiation by several connected field-effect transistors. For this enhanced nonresonant detection, we have designed, fabricated, and tested plasmonic structures consisting of multiple InGaAs/GaAs pseudomorphic high electron-mobility transistors connected in series. Results show a 1.63-THz response that is

HP memristor mathematical model for periodic signals and DC

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Ahmed Radwan, et al., " HP memristor mathematical model for periodic signals and DC". In 2010 53rd IEEE International Midwest Symposium on Circuits and Systems, 2010, 861. In this paper mathematical models of the HP Memristor for DC and periodic signal inputs are provided. The need for a rigid model for the Memristor using conventional current and voltage quantities is essential for the development of many promising Memristors' applications. Unlike the previous works, which focuses on the sinusoidal input waveform, we derived rules for any periodic signals in general in terms of voltage and

A best-first tree-searching approach for ML decoding in MIMO system

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Chung-An Shen, et al., "A best-first tree-searching approach for ML decoding in MIMO system." In Proceedings of 2010 IEEE International Symposium on Circuits and Systems, 2010, 3533. In MIMO communication systems maximum-likelihood (ML) decoding can be formulated as a tree-searching problem. This paper presents a tree-searching approach that combines the features of classical depth-first and breadth-first approaches to achieve close to ML performance while minimizing the number of visited nodes. A detailed outline of the algorithm is given, including the required storage. The effects of

Time domain oscillating poles: stability redefined in memristor based Wien-oscillators

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Abdul Hafiz Talukdar, et al., "Time domain oscillating poles: stability redefined in memristor based Wien-oscillators." In 2010 International Conference on Microelectronics, 2010, 288. Traditionally, the necessary and sufficient condition for any system to be oscillating is that its poles are located on the imaginary (jω) axis. In this paper, for the first time, we have shown that systems can oscillate with time-domain oscillating poles. The idea is verified using a Memristor based Wien oscillator. Sustained oscillations are observed without having the poles of the system fixed on the

Nonlinear analysis of ring oscillator circuits

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Xiaoqing Ge, et al., "Nonlinear analysis of ring oscillator circuits." In Proceedings of the 2010 American Control Conference, 2010, 1772. Using nonlinear systems techniques, we analyze the stability properties and synchronization conditions for ring oscillator circuits, which are essential building blocks in digital systems. By making use of its cyclic structure, we investigate local and global stability properties of an n-stage ring oscillator. We present a sufficient condition for global asymptotic stability of the origin and obtain necessity if the ring oscillator consists of identical

An adaptive hybrid multiprocessor technique for bioinformatics sequence alignment

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Talal Bonny, et al., "An adaptive hybrid multiprocessor technique for bioinformatics sequence alignment." In 2010 5th cairo international biomedical engineering conference, 2010, 112. Sequence alignment algorithms such as the Smith-Waterman algorithm are among the most important applications in the development of bioinformatics. Sequence alignment algorithms must process large amounts of data which may take a long time. Here, we introduce our Adaptive Hybrid Multiprocessor technique to accelerate the implementation of the Smith-Waterman algorithm. Our technique utilizes both the graphics

Sinusoidal oscillators with lower gain requirements at higher frequencies based on an explicit tanh(x) nonlinearity

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Ahmed S. Elwakil, et al., "Sinusoidal oscillators with lower gain requirements at higher frequencies based on an explicit tanh (x) nonlinearity." International Journal of Circuit Theory and Applications 38, (7), 2010, 747. Two novel sinusoidal oscillator structures with an explicit tanh(x) nonlinearity are proposed. The oscillators have the attractive feature: the higher the operating frequency, the lower the necessary gain required to start oscillations. A nonlinear model for the two oscillators is derived and verified numerically. Spice simulations using AMS BiCMOS 0.35µ model parameters and

Design, implementation and analysis of fully digital 1-D controllable multiscroll chaos

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Abhinav Mansingka, et al., "Design, implementation and analysis of fully digital 1-D controllable multiscroll chaos" ICM 2011 Proceeding, 2011, 1. This paper introduces the fully digital implementation of a 1-D multiscroll chaos generator based on a staircase nonlinearity in the 3rd-order jerk system using the Euler approximation. For the first time, digital design is exploited to provide real-time controllability of (i) number of scrolls, (ii) position in 1-D space, (iii) Euler step size and (iv) system parameter. The effect of variations in these fields on the maximum Lyapunov exponent (MLE)

Fractional smith chart theory

1 min read ·
Atif Shamim, et al., "Fractional smith chart theory." IEEE Microwave and Wireless Components Letters 21, (3) , 2011, 117. For the first time, a generalized Smith chart is introduced here to represent fractional order circuit elements. It is shown that the standard Smith chart is a special case of the generalized fractional order Smith chart. With illustrations drawn for both the conventional integer based lumped elements and the fractional elements, a graphical technique supported by the analytical method is presented to plot impedances on the fractional Smith chart. The concept is then

Gain-enhanced LTCC system-on-package for automotive UMRR applications

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Farhan Abdul Ghaffar, et al., "Gain-enhanced LTCC system-on-package for automotive UMRR applications." In 2010 53rd IEEE International Midwest Symposium on Circuits and Systems, 2010, 934. Abstract: A novel Low Temperature Co-fired Ceramic (LTCC) based SoP for automotive radar applications is presented. For the first time a combination of a relatively low dielectric constant LTCC substrate and a high dielectric constant LTCC superstrate has been incorporated to enhance the overall gain of the module. The superstrate can provide additional protection to the integrated circuits (IC) in the harsh

On the mathematical modeling of memristors

1 min read ·
Radwan, Ahmed G., et al., "On the mathematical modeling of memristors." In 2010 International Conference on Microelectronics, 2010, 284. Since the fourth fundamental element (Memristor) became a reality by HP labs, and due to its huge potential, its mathematical models became a necessity. In this paper, we provide a simple mathematical model of Memristors characterized by linear dopant drift for sinusoidal input voltage, showing a high matching with the nonlinear SPICE simulations. The frequency response of the Memristor's resistance and its bounding conditions are derived. The fundamentals of

Nonlinear Analysis of Ring Oscillator and Cross-Coupled Oscillator Circuits

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Ge Xiaoqing, et al., "Nonlinear analysis of ring oscillator and cross-coupled oscillator circuits." Dynamics of Continuous, Discrete and Impulsive Systems Series B: Applications and Algorithms , 2010, 1. Hassan Khalil’s research results and beautifully written textbook on nonlinear systems have influenced generations of researchers, including the authors of this paper. Using nonlinear systems techniques, this paper analyzes ring oscillator and cross-coupled oscillator circuits, which are essential building blocks in digital systems. The paper first investigates local and global stability

Evaluation framework for K-Best sphere decoders

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Chung-An Shen, et al., "Evaluation framework for K-best sphere decoders." Journal of Circuits, Systems, and Computers 19 (05), 2010, 975. While Maximum-Likelihood (ML) is the optimum decoding scheme for most communication scenarios, practical implementation difficulties limit its use, especially for Multiple Input Multiple Output (MIMO) systems with a large number of transmit or receive antennas. Tree-searching type decoder structures such as Sphere decoder and K-best decoder present an interesting trade-off between complexity and performance. Many algorithmic developments and VLSI

Enhanced plasma wave detection of terahertz radiation using multiple high electron-mobility transistors connected in series

1 min read ·
Tamer Elkhatib, et al., "Enhanced plasma wave detection of terahertz radiation using multiple high electron-mobility transistors connected in series." IEEE transactions on microwave theory and techniques 58, (2), 2010, 331. We report on enhanced room-temperature detection of terahertz radiation by several connected field-effect transistors. For this enhanced nonresonant detection, we have designed, fabricated, and tested plasmonic structures consisting of multiple InGaAs/GaAs pseudomorphic high electron-mobility transistors connected in series. Results show a 1.63-THz response that is directly

Generalized model for memristor-based Wien family oscillators

1 min read ·
Abdul Hafiz Talukdar, et al., "Generalized model for memristor-based Wien family oscillators." Microelectronics Journal 42 (9), 2011, 1032. In this paper, we report the unconventional characteristics of Memristor in Wien oscillators. Generalized mathematical models are developed to analyze four members of the Wien family using Memristors. Sustained oscillation is reported for all types though oscillating resistance and time dependent poles are present. We have also proposed an analytical model to estimate the desired amplitude of oscillation before the oscillation starts. These Memristor-based

Design and implementation of a sort-free K-best sphere decoder

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Sudip Mondal, et al.,"Design and Implementation of a Sort-Free K-Best Sphere Decoder," in IEEE Transactions on Very Large Scale Integration (VLSI) Systems 18, (10), 2010, 1497. This paper describes the design and very-large-scale integration (VLSI) architecture for a 4 × 4 breadth-first K-best multiple-input-multiple-output (MIMO) decoder using a 64 quadrature-amplitude modulation (QAM) scheme. A novel sort-free approach to path extension, as well as quantized metrics result in a high-throughput VLSI architecture with lower power and area consumption compared to state-of-the-art published

High performance technique for database applications using a hybrid gpu/cpu platform

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Mohamed Zidan, et al., "High performance technique for database applications using a hybrid gpu/cpu platform." In Proceedings of the 21st edition of the great lakes symposium on Great lakes symposium on VLSI, 2011, 85. Many database applications, such as sequence comparing, sequence searching, and sequence matching, etc, process large database sequences. we introduce a novel and efficient technique to improve the performance of database applications by using a Hybrid GPU/CPU platform. In particular, our technique solves the problem of the low efficiency resulting from running short-length

Analysis of bus width and delay on a fully digital signum nonlinearity chaotic oscillator

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Abhinav Mansingka, et al., "Analysis of bus width and delay on a fully digital signum nonlinearity chaotic oscillator." In 2011 IEEE 54th International Midwest Symposium on Circuits and Systems (MWSCAS), 2011, 1. Abstract: This paper introduces the first fully digital implementation of a 3rd order ODE-based chaotic oscillator with signum nonlinearity. A threshold bus width of 12-bits for reliable chaotic behavior is observed, below which the system output becomes periodic. Beyond this threshold, the maximum Lyapunov exponent (MLE) is shown to improve up to a peak value at 16-bits and

Hardware Realization of Chaos Based Block Cipher for Image Encryption

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Mohamed L. Barakat, et al., "Hardware realization of chaos based block cipher for image encryption." In ICM 2011 Proceeding, 2011, 1. Unlike stream ciphers, block ciphers are very essential for parallel processing applications. In this paper, the first hardware realization of chaotic-based block cipher is proposed for image encryption applications. The proposed system is tested for known cryptanalysis attacks and for different block sizes. When implemented on Virtex-IV, system performance showed high throughput and utilized small area. Passing successfully in all tests, our system proved to be

A Compact QPSK Modulator with Low Amplitude and Phase Imbalance for Remote Sensing Applications

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Farhan Abdul Ghaffar, et al., " A Compact QPSK Modulator with Low Amplitude and Phase Imbalance for Remote Sensing Applications" Canadian Journal on Electrical and Electronics Engineering 2, (4), 2011, 1. A new, compact and wide-band Quadrature Phase Shift Keying (QPSK) modulator is presented for remote sensing applications. The microstrip-based modulator employs quadrature hybrid coupler, Wilkinson divider, rat race coupler and GaAs MESFET switches. It is designed to be part of an X band remote sensing transmitter with a center frequency of 8.25GHz. The fabricated module demonstrates the

Random number generation based on digital differential chaos

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Mohamed Zidan, et al., "Random number generation based on digital differential chaos." In 2011 IEEE 54th International Midwest Symposium on Circuits and Systems (MWSCAS), 2011, 1. In this paper, we present a fully digital differential chaos based random number generator. The output of the digital circuit is proved to be chaotic by calculating the output time series maximum Lyapunov exponent. We introduce a new post processing technique to improve the distribution and statistical properties of the generated data. The post-processed output passes the NIST Sp. 800-22 statistical tests. The system

Design and Comparison of LTCC Based Fractal Antennas

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Farhan Abdul Ghaffar, et al., "Design and comparison of LTCC based fractal antennas." In Proc. URSI Gen. Assem. Sci. Symp., 2011, 1. The paper presents design of three different fractal antennas in Low Temperature Co-fired Ceramic (LTCC) substrate. An aperture coupled feeding technique has been used in all the three designs which is highly suitable for multi-layer system on package (SoP) concept. The three fractal designs demonstrated are Sierpinski carpet fractal antenna, Sierpinski gasket fractal antenna and Koch snowflake fractal antenna. Bandwidths of 1.8 GHz (7.5%), 1.75 GHz (7.5%) and 1

High Dynamic Range Adaptive ΑΣ-Based Focal Plane Array Architecture

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Shun Yao, et al., "High Dynamic Range adaptive ΔΣ-based Focal Plane Array architecture." In 2011 Conference Record of the Forty Fifth Asilomar Conference on Signals, Systems and Computers (ASILOMAR), 2011, 505. Abstract: In this paper, an Adaptive Delta-Sigma based architecture for High Dynamic Range (HDR) Focal Plane Arrays is presented. The noise shaping effect of the Delta-Sigma modulation in the low end, and the distortion noise induced in the high end of Photo-diode current were analyzed in detail. The proposed architecture can extend the DR for about 20N log2 dB at the high end of Photo

Theory and Numerical Methods-Fractional Smith Chart Theory

1 min read ·
Atef Shamim, et al., "Fractional Smith Chart Theory," in IEEE Microwave and Wireless Components Letters 21, (3), 117. For the first time, a generalized Smith chart is introduced here to represent fractional order circuit elements. It is shown that the standard Smith chart is a special case of the generalized fractional order Smith chart. With illustrations drawn for both the conventional integer based lumped elements and the fractional elements, a graphical technique supported by the analytical method is presented to plot impedances on the fractional Smith chart. The concept is then applied

FAST GLOBAL SEQUENCE ALIGNMENT TECHNIQUE

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Talal Bonny, et al., "Fast global sequence alignment technique." In 2011 Conference Record of the Forty Fifth Asilomar Conference on Signals, Systems and Computers (ASILOMAR), 2011, 1046. Bioinformatics database is growing exponentially in size. Processing these large amount of data may take hours of time even if super computers are used. One of the most important processing tool in Bioinformatics is sequence alignment. We introduce fast alignment algorithm, called `Alignment By Scanning' (ABS), to provide an approximate alignment of two DNA sequences. We compare our algorithm with the

Memristor-based relaxation oscillators using digital gates

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Moustafa A. Khatib, et al., "Memristor-based relaxation oscillators using digital gates." In 2012 Seventh International Conference on Computer Engineering & Systems (ICCES), 2012, 98. This paper presents two memristor-based relaxation oscillators. The proposed oscillators are designed without the need of any reactive elements, i.e., capacitor or inductor. As the "resistance storage" property of the memristor can be exploited to generate the oscillation. The proposed oscillators have the advantage that they can be fully integrated on-chip giving an area-efficient solution. Furthermore, these

Fractional-order RC and RL circuits

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Ahmed Radwan, et al., "Fractional-order RC and RL circuits" Circuits, Systems, and Signal Processing 31 (6), 2012, 1901. This paper is a step forward to generalize the fundamentals of the conventional RC and RL circuits in fractional-order sense. The effect of fractional orders is the key factor for extra freedom, more flexibility, and novelty. The conditions for RC and RL circuits to act as pure imaginary impedances are derived, which are unrealizable in the conventional case. In addition, the sensitivity analyses of the magnitude and phase response with respect to all parameters showing the

The fractional-order modeling and synchronization of electrically coupled neuron systems

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Khaled Moaddy, et al., "The fractional-order modeling and synchronization of electrically coupled neuron systems" Computers and Mathematics with Applications 64 (10), 2012, 3329. Abstract: In this paper, we generalize the integer-order cable model of the neuron system into the fractional-order domain, where the long memory dependence of the fractional derivative can be a better fit for the neuron response. Furthermore, the chaotic synchronization with a gap junction of two or multi-coupled-neurons of fractional-order are discussed. The circuit model, fractional-order state equations and the

Impedance matching through a single passive fractional element

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Ahmed Radwan, et al., "Impedance matching through a single passive fractional element." In Proceedings of the 2012 IEEE International Symposium on Antennas and Propagation, 2012, 1. For the first time, a generalized admittance Smith chart theory is introduced to represent fractional order circuit elements. The principles of fractional order matching circuits are described. We show that for fractional order α ; 1, a single parallel fractional element can match a wider range of load impedances as compared to its series counterpart. Several matching examples demonstrate the versatility of

Differential RF MEMS interwoven capacitor immune to residual stress warping

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Amro M. Elshurafa, , et al., "Differential RF MEMS interwoven capacitor immune to residual stress warping." Micro & Nano Letters 7 (7), 2012, 658. A RF MEMS capacitor with an interwoven structure is designed, fabricated in the PolyMUMPS process and tested in an effort to address fabrication challenges usually faced in MEMS processes. The interwoven structure was found to offer several advantages over the typical MEMS parallel-plate design including eliminating the warping caused by residual stress, eliminating the need for etching holes, suppressing stiction, reducing parasitics and providing

Memristor-based mono-stable oscillator

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Bahgat, A. T., et al., "Memristor-based mono-stable oscillator." arXiv preprint , (2012). In this letter, a reactance-less mono-stable oscillator is introduced for the first time using memristors. By replacing bulky inductors and capacitors with memristors, the novel mono-stable oscillator can be an area-efficient solution for on-chip fully integrated systems. The proposed circuit is described, mathematically analysed and verified by circuit simulations.

Memristor: the illusive device

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Salama, Khaled Nabil. et al., "Memristor: the illusive device." In Proceedings of the great lakes symposium on VLSI, 2012, 208. The memristor (M) is considered to be the fourth two-terminal passive element in electronics, alongside the resistor (R), the capacitor (C), and the inductor (L). Its existence was postulated in 1971 but its first implementation was reported in 2008. Where was it hiding all that time and what can we do with it? Come and learn how the memristor completes the roster of electronic devices much like a missing particle that physicists seek to complete their tableaus.

The integrated satellite-acoustic telemetry (iSAT) system for tracking marine megafauna

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De la Torre Pedro, et al., "The integrated satellite-acoustic telemetry (iSAT) system for tracking marine megafauna." In 2012 Oceans-Yeosu, 2012, 1. This document describes the integrated satellite-acoustic telemetry (iSAT) system: an autonomous modular system for tracking the movements of large pelagic fish using acoustic telemetry and satellite communications. The sensor platform is described along with the propulsion and navigation systems. An application for tracking the whale shark (Rhincodon typus) in the Red Sea is included along with a discussion of the technical difficulties that such

Two-layer radio frequency MEMS fractal capacitors in PolyMUMPS for S-band applications

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Amro Elshurafa, et al., "Two-layer radio frequency MEMS fractal capacitors in PolyMUMPS for S-band applications." Micro & Nano Letters 7, (5), 2012, 419. In this Letter, the authors fabricate for the first time MEMS fractal capacitors possessing two layers and compare their performance characteristics with the conventional parallel-plate capacitor and previously reported state-of-the-art single-layer MEMS fractal capacitors. Explicitly, a capacitor with a woven structure and another with an interleaved configuration were fabricated in the standard PolyMUMPS surface micromachining process and

Low-voltage puzzle-like fractal microelectromechanial system variable capacitor suppressing pull-in

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Amro M. Elshurafa, et al., "Low-voltage puzzle-like fractal microelectromechanial system variable capacitor suppressing pull-in" Micro & Nano Letters 7, (9), 2012, 965. Abstract: This Letter introduces an electrostatically actuated fractal MEMS variable capacitor that, by utilising the substrate, extends the tuning range (TR) beyond the theoretical limit of 1.5 as dictated by the pull-in phenomenon. The backbone concept behind the fractal varactor is to create a suspended movable plate possessing a specific fractal geometry, and to simultaneously create a bottom fixed plate complementary in

Two-layer radio

1 min read ·
Amro Elshurafa, et al., "Two-layer radio frequency MEMS fractal capacitors in PolyMUMPS for S-band applications." Micro & Nano Letters 7 (5), 2012, 419. In this letter, we fabricate for the first time MEMS fractal capacitors possessing two layers and compare their performance characteristics with the conventional parallel-plate capacitor and previously reported state-of-the-art singlelayer MEMS fractal capacitors. Explicitly, a capacitor with a woven structure and another with an interleaved configuration were fabricated in the standard PolyMUMPS surface micromachining process and tested at S

Determination of maximum power transfer conditions of bimorph piezoelectric energy harvesters

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Mahmoud Al Ahmad, et al., "Determination of maximum power transfer conditions of bimorph piezoelectric energy harvesters." Journal of Applied Physics 111 (10), 2012, 102812 In this paper, a method to find the maximum power transfer conditions in bimorph piezoelectric-based harvesters is proposed. Explicitly, we derive a closed form expression that relates the load resistance to the mechanical parameters describing the bimorph based on the electromechanical, single degree of freedom, analogy. Further, by taking into account the intrinsic capacitance of the piezoelectric harvester, a more

Effect of boundary on controlled memristor-based oscillator

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Mohamed E. Fouda, et al., "Effect of boundary on controlled memristor-based oscillator." In 2012 International Conference on Engineering and Technology (ICET), 2012, 1. Abstract: Recently, the applications of memristors have spread into many fields and especially in the circuit theory. Many models have been proposed for the HP-memristor based on the window functions. In this paper, we introduce a complete mathematical analysis of the controlled reactance-less oscillator for two different window functions of Joglekar's model (linear and nonlinear dopant drift) to discuss the effect of changing

Fully Digital 1-D, 2-D and 3-D Multiscroll Chaos as Hardware Pseudo Random Number Generators

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Abhinav Mansingka, et al., "Fully digital 1-D, 2-D and 3-D multiscroll chaos as hardware pseudo random number generators." In 2012 IEEE 55th International Midwest Symposium on Circuits and Systems (MWSCAS), 2012, 1180. This paper introduces the first fully digital implementation of 1-D, 2-D and 3-D multiscroll chaos using the sawtooth nonlinearity in a 3rd order ODE with the Euler approximation. Systems indicate chaotic behaviour through phase space boundedness and positive Lyapunov exponent. Low-significance bits form a PRNG and pass all tests in the NIST SP. 800-22 suite without post

Non linear dynamics of memristor based 3rd order oscillatory system

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Arka Talukdar, et al., "Non linear dynamics of memristor based 3rd order oscillatory system." Microelectronics journal 43 (3), 2012, 169. In this paper, we report for the first time the nonlinear dynamics of three memristor based phase shift oscillators, and consider them as a plausible solution for the realization of parametric oscillation as an autonomous linear time variant system. Sustained oscillation is reported through oscillating resistance while time dependent poles are present. The memristor based phase shift oscillator is explored further by varying the parameters so as to present

A Best-First Soft/Hard Decision Tree Searching MIMO Decoder for a 4×4 64-QAM System

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Chung-An Shen, et al., "A Best-First Soft/Hard Decision Tree Searching MIMO Decoder for a 4×4 64-QAM System" IEEE Transactions on Very Large Scale Integration (VLSI) Systems 20, (8), 2012, 1537. Abstract: This paper presents the algorithm and VLSI architecture of a configurable tree-searching approach that combines the features of classical depth-first and breadth-first methods. Based on this approach, techniques to reduce complexity while providing both hard and soft outputs decoding are presented. Furthermore, a single programmable parameter allows the user to tradeoff throughput versus BER

Microscale Electrostatic Fractional Capacitors using Reduced Graphene Oxide Percolated Polymer Composites

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Amro M Elshurafa, et al., "Microscale Electrostatic Fractional Capacitors using Reduced Graphene Oxide Percolated Polymer Composites" Applied Physics Letters 102, 2013, 232991. Abstract: We show that graphene-percolated polymer composites exhibit fractional capacitance response in the frequency range of 50 kHz–2 MHz. In addition, it is shown that by varying the loading of graphene within the matrix from 2.5% to 12%, the phase can be controllably tuned from −67° to −31°, respectively. The electrostatic fractional capacitors proposed herein are easy to fabricate and offer integration capability

Secure Ds-CDMA spreading codes using fully digital multidimensional multiscroll chaos

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Abhinav S. Mansingka, et al., "Secure Ds-CDMA spreading codes using fully digital multidimensional multiscroll chaos." In 2013 IEEE 56th International Midwest Symposium on Circuits and Systems (MWSCAS), 2013, 1334. This paper introduces a generalized fully digital hardware implementation of 1-D, 2-D and 3-D multiscroll chaos through sawtooth nonlinearities in a 3rd order ODE with the Euler approximation, wherein low-significance bits pass all NIST SP. 800-22 tests. The low-significance bits show good performance as spreading code for multiple-access DS-CDMA in AWGN and multipath environments

On the short-term predictability of fully digital chaotic oscillators for pseudo-random number generation

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Ahmed G. Radwan, et al., "On the short-term predictability of fully digital chaotic oscillators for pseudo-random number generation." In 2013 IEEE 20th International Conference on Electronics, Circuits, and Systems (ICECS), 2013, 373. This paper presents a digital implementation of a 3rd order chaotic system using the Euler approximation. Short-term predictability is studied in relation to system precision, Euler step size and attractor size and optimal parameters for maximum performance are derived. Defective bits from the native chaotic output are neglected and the remaining pass the NIST SP

Parametric control on fractional-order response for Lü chaotic system

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Khaled Moaddy, et al., "Parametric control on fractional-order response for Lü chaotic system." In Journal of Physics: Conference Series, 423, (1), 2013, 012024. Abstract. This paper discusses the influence of the fractional order parameter on conventional chaotic systems. These fractional-order parameters increase the system degree of freedom allowing it to enter new domains and thus it can be used as a control for such dynamical systems. This paper investigates the behaviour of the equally-fractional-order Lü chaotic system when changing the fractional-order parameter and determines the

Fibonacci-based hardware post-processing for non-autonomous signum hyperchaotic system

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bhinav AMansingka, et al., "Fibonacci-based hardware post-processing for non-autonomous signum hyperchaotic system." In 2013 International Conference on IT Convergence and Security (ICITCS), 2013, 1. This paper presents a hardware implementation of a robust non-autonomous hyperchaotic-based PRNG driven by a 256-bit LFSR. The original chaotic output is post-processed using a novel technique based on the Fibonacci series, bitwise XOR, rotation, and feedback. The proposed post-processing technique preserves the throughput of the system and enhances the randomness in the output which is verified

Implantable intraocular pressure monitoring systems: Design considerations

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Muhammad Arsalan, et al., "Implantable intraocular pressure monitoring systems: Design considerations." In 2013 IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-BIO), 2013, 1. Design considerations and limitations of implantable Intraocular Pressure Monitoring (IOPM) systems are presented in this paper. Detailed comparison with the state of the art is performed to highlight the benefits and challenges of the proposed design. The system-on-chip, presented here, is battery free and harvests energy from incoming RF

ISAT: The mega-fauna acoustic tracking system

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De la Torre Pedro, et al., "ISAT: The mega-fauna acoustic tracking system." In 2013 MTS/IEEE OCEANS-Bergen, 2013, 1. The acoustic tracking module of the Integrated Satellite and Acoustic Telemetry (iSAT) system is discussed in detail. iSAT is capable of detecting the relative direction of an acoustic source by measuring the order of arrival (OOA) of the acoustic signal to each hydrophone in a triangular array. The characteristics of the hydrophones, the projector, and the target acoustic signal used for iSAT are described. Initially it is designed to study the movements of whale sharks

Modeling and fabrication of an RF MEMS variable capacitor with a fractal geometry

1 min read ·
Elshurafa, A. M., et al., "Modeling and fabrication of an RF MEMS variable capacitor with a fractal geometry". In 2013 IEEE International Symposium on Circuits and Systems, 2013, 2711. In this paper, we model, fabricate, and measure an electrostatically actuated MEMS variable capacitor that utilizes a fractal geometry and serpentine-like suspension arms. Explicitly, a variable capacitor that possesses a top suspended plate with a specific fractal geometry and also possesses a bottom fixed plate complementary in shape to the top plate has been fabricated in the PolyMUMPS process. An important

Generalized Hardware Post Processing Technique for Chaos-Based Pseudorandom Number Generators

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Mohamed L. Barakat, et al., "Generalized Hardware Post Processing Technique for Chaos-Based Pseudorandom Number Generators" ETRI Journal, 35, (3), 2013, 448. Abstract: This paper presents a generalized post‐processing technique for enhancing the pseudorandomness of digital chaotic oscillators through a nonlinear XOR‐based operation with rotation and feedback. The technique allows full utilization of the chaotic output as pseudorandom number generators and improves throughput without a significant area penalty. Digital design of a third‐order chaotic system with maximum function nonlinearity is

Improved Memristor-Based Relaxation Oscillator

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Ahmed G. Musad, et al., "Improved Memristor-Based Relaxation Oscillator" Microelectronics Journal Volume 44, (9), 2013, 814. Abstract: This paper presents an improved memristor-based relaxation oscillator which offers higher frequency and wider tunning range than the existing reactance-less oscillators. It also has the capability of operating on two positive supplies or alternatively a positive and negative supply. Furthermore, it has the advantage that it can be fully integrated on-chip providing an area-efficient solution. On the other hand, The oscillation concept is discussed then a

Fully digital jerk-based chaotic oscillators for high throughput pseudo-random number generators up to 8.77 Gbitss

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Abhinav S. Mansingka, et al., "Fully digital jerk-based chaotic oscillators for high throughput pseudo-random number generators up to 8.77 Gbitss" Microelectronics Journal 44, (9), 2013, 744. Abstract: This paper introduces fully digital implementations of four different systems in the 3rd order jerk-equation based chaotic family using the Euler approximation. The digitization approach enables controllable chaotic systems that reliably provide sinusoidal or chaotic output based on a selection input. New systems are introduced, derived using logical and arithmetic operations between two system

Memristor-based memory The sneak paths problem and solutions

1 min read ·
Mohammed A. Zidan, et al., "Memristor-based memory The sneak paths problem and solutions" Microelectronics Journal 44, (2), 2013, 176. Abstract: In this paper, we investigate the read operation of memristor-based memories. We analyze the sneak paths problem and provide a noise margin metric to compare the various solutions proposed in the literature. We also analyze the power consumption associated with these solutions. Moreover, we study the effect of the aspect ratio of the memory array on the sneak paths. Finally, we introduce a new technique for solving the sneak paths problem by gating

5.2-GHz RF Power Harvesting Module in 0.18 μm CMOS for Biomedical Implantable Sensors

1 min read ·
Mahmoud H. Ouda, et al., "5.2-GHz RF Power Harvesting Module in 0.18 μm CMOS for Biomedical Implantable Sensors" IEEE Transactions on Microwave Theory and Techniques 61, (5), 2013, 2177. Abstract: A first fully integrated 5.2-GHz CMOS-based RF power harvester with an on-chip antenna is presented in this paper. The design is optimized for sensors implanted inside the eye to wirelessly monitor the intraocular pressure of glaucoma patients. It includes a five-stage RF rectifier with an on-chip antenna, a dc voltage limiter, two voltage sensors, a low dropout voltage regulator, and MOSCAP based on

50V All-PMOS Charge Pumps Using Low-Voltage Capacitors

1 min read ·
Ahmed Emira, et al., "50V All-PMOS Charge Pumps Using Low-Voltage Capacitors" IEEE Transactions on Industrial Electronics 60, (10), 2013, 4683. Abstract: In this paper, two high-voltage charge pumps (CPs) are introduced. In order to minimize the area of the pumping capacitors, which dominates the overall area of the CP, high-density capacitors have been utilized. Nonetheless, these high-density capacitors suffer from low breakdown voltage, which is not compatible with the targeted high-voltage application. To circumvent the breakdown limitation, a special clocking scheme is used to limit the

Towards neuromorphic electronics: Memristors on foldable silicon fabric

1 min read ·
MT Ghoneim, et al., "Towards neuromorphic electronics: Memristors on foldable silicon fabric" Microelectronics Journal 45 (11), 2014, 1392. The advantages associated with neuromorphic computation are rich areas of complex research. We address the fabrication challenge of building neuromorphic devices on structurally foldable platform with high integration density. We present a CMOS compatible fabrication process to demonstrate for the first time memristive devices fabricated on bulk monocrystalline silicon (100) which is next transformed into a flexible thin sheet of silicon fabric with all

An integrated energy-efficient capacitive sensor digital interface circuit

1 min read ·
Hesham Omran, et al., "An integrated energy-efficient capacitive sensor digital interface circuit." Sensors and Actuators A: Physical 216, 2014, 43. In this paper, we propose an energy-efficient 13-bit capacitive sensor interface circuit. The proposed design fully relies on successive approximation algorithm, which eliminates the need for oversampling and digital decimation filtering, and thus low-power consumption is achieved. The proposed architecture employs a charge amplifier stage to achieve parasitic insensitive operation and fine absolute resolution. Moreover, the output code is not

Control and switching synchronization of fractional order chaotic systems using active control technique

1 min read ·
Ahmed G. Radwan, et al., "Control and switching synchronization of fractional order chaotic systems using active control technique." Journal of Advanced Research 5 (1), 2014, 125. This paper discusses the continuous effect of the fractional order parameter of the Lü system where the system response starts stable, passing by chaotic behavior then reaching periodic response as the fractional-order increases. In addition, this paper presents the concept of synchronization of different fractional order chaotic systems using active control technique. Four different synchronization cases are

A family of memristor‐based reactance‐less oscillators

1 min read ·
mohamed Zidan, et al., "A family of memristor‐based reactance‐less oscillators." International Journal of Circuit Theory and Applications 42 (11), 2014, 1103. In this paper, we present for the first time a family of memristor‐based reactance‐less oscillators (MRLOs). The proposed oscillators require no reactive components, that is, inductors or capacitors, rather, the ‘resistance storage’ property of memristor is exploited to generate the oscillation. Different types of MRLO family are presented, and for each type, closed form expressions are derived for the oscillation condition, oscillation

Memristor Multi-Port Readout: A Closed-Form Solution for Sneak-Paths

1 min read ·
Mohamed Zidan, et al., "Memristor multiport readout: A closed-form solution for sneak paths." IEEE Transactions on Nanotechnology 13 (20), 2014, 274. In this paper, we introduce for the first time, a closed-form solution for the memristor-based memory sneak paths without using any gating elements. The introduced technique fully eliminates the effect of sneak paths by reading the stored data using multiple access points and evaluating a simple addition/subtraction on the different readings. The new method requires fewer reading steps compared to previously reported techniques, and has a very

A 7.9 pJ/Step Energy-Efficient Multi-Slope 13-bit Capacitance-to-Digital Converter

1 min read ·
Hesham Omran, et al., "7.9 pJ/step energy-efficient multi-slope 13-bit capacitance-to-digital converter." IEEE Transactions on Circuits and Systems II: Express Briefs 61 (8), 2014, 589. In this brief, an energy-efficient capacitance-to-digital converter (CDC) is presented. The proposed CDC uses digitally controlled coarse-fine multi-slope integration to digitize a wide range of capacitance in short conversion time. Both integration current and frequency are scaled, which leads to significant improvement in the energy efficiency of both analog and digital circuitry. Mathematical analysis for

Ultrafast nonlinear response of gold gyroid three-dimensional metamaterials

1 min read ·
Petros Farah, et al., "Ultrafast nonlinear response of gold gyroid three-dimensional metamaterials." Physical Review Applied 2, (4), 2014, 044002. We explore the nonlinear optical response of three-dimensional gyroidal metamaterials, which show greater than tenfold enhancements compared to all other metallic nanomaterials as well as bulk gold. A simple analytical model for this metamaterial response shows how the reflectivity spectrum scales with the metal fill fraction and the refractive index of the material that the metallic nanostructure is embedded in. The ultrafast response arising from

Achieving nanoscale horizontal separations in the standard 2 μm PolyMUMPS process

1 min read ·
Amro M Elshurafa, et al., "Achieving nanoscale horizontal separations in the standard 2 μm PolyMUMPS process." Applied Nanoscience 4 (2), 2014, 241. This paper shares with the research community how to achieve, effectively and easily, lateral submicron separations in the standard 2 μm PolyMUMPS process without any fabrication intervention or post-processing, based on the oxide sidewall spacer technique. Thousands of nanoseparations were created and successfully tested by visual inspection and by a simple capacitance measurement. The lateral separations attained were less than 440 nm and

Interference mitigation for broadcast in hierarchical cell structure networks: Transmission strategy and area spectral efficiency

1 min read ·
Yuli Yang, et al., "Interference mitigation for broadcast in hierarchical cell structure networks: Transmission strategy and area spectral efficiency." IEEE Transactions on Vehicular Technology 63 (8), 2014, 3818. Abstract: In this paper, a hierarchical cell structure (HCS) is considered, where an access point (AP) broadcasts to local nodes (LNs) over orthogonal frequency subbands within a local cell located in a macrocell. Since the local cell shares the spectrum licensed to the macrocell, a given LN is interfered with by the macrocell user (MU)'s transmissions over the same subband. To

Hardware stream cipher with controllable chaos generator for colour image encryption

1 min read ·
Mohamed L. Barakat, et al., "Hardware stream cipher with controllable chaos generator for colour image encryption" IET Image Processing 8 (1), 2014, 33. This study presents hardware realisation of chaos-based stream cipher utilised for image encryption applications. A third-order chaotic system with signum non-linearity is implemented and a new post processing technique is proposed to eliminate the bias from the original chaotic sequence. The proposed stream cipher utilises the processed chaotic output to mask and diffuse input pixels through several stages of XORing and bit permutations. The

Compensated readout for high-density MOS-gated memristor crossbar array

1 min read ·
Mohamed Zidan, et al., "Compensated readout for high-density MOS-gated memristor crossbar array." IEEE Transactions on Nanotechnology 14 (1), 2014, 3. Leakage current is one of the main challenges facing high-density MOS-gated memristor arrays. In this study, we show that leakage current ruins the memory readout process for high-density arrays, and analyze the tradeoff between the array density and its power consumption. We propose a novel readout technique and its underlying circuitry, which is able to compensate for the transistor leakage-current effect in the high-density gated memristor

Insights on capacitive interdigitated electrodes coated with MOF thin films: Humidity and VOCs sensing as a case study

1 min read ·
Christos Sapsanis, et al., "Insights on capacitive interdigitated electrodes coated with MOF thin films: Humidity and VOCs sensing as a case study." Sensors 15 (8), 2015, 18153. A prototypical metal-organic framework (MOF), a 2D periodic porous structure based on the assembly of copper ions and benzene dicarboxylate (bdc) ligands (Cu (bdc)· xH 2 O), was grown successfully as a thin film on interdigitated electrodes (IDEs). IDEs have been used for achieving planar CMOS-compatible low-cost capacitive sensing structures for the detection of humidity and volatile organic compounds (VOCs)

Memristors Empower Spiking Neurons With Stochasticity

1 min read ·
Maruan Al-Shedivat, et al., "Memristors empower spiking neurons with stochasticity." IEEE journal on Emerging and Selected Topics in Circuits and Systems 5 (2), 2015, 242. Abstract: Recent theoretical studies have shown that probabilistic spiking can be interpreted as learning and inference in cortical microcircuits. This interpretation creates new opportunities for building neuromorphic systems driven by probabilistic learning algorithms. However, such systems must have two crucial features: 1) the neurons should follow a specific behavioral model, and 2) stochastic spiking should be

Spectrum band selection in delay-QoS constrained cognitive radio networks

1 min read ·
Yuli Yang, et al., "Spectrum band selection in delay-QoS constrained cognitive radio networks." IEEE Transactions on Vehicular Technology 64 (7), 2014, 2925. Abstract: In this paper, a cognitive radio (CR) network with multiple spectrum bands available for secondary users (SUs) is considered. For the SU's active spectrum-band selection, two criteria are developed. One is to select the band with the highest secondary channel power gain, and the other is to select the band with the lowest interference channel power gain to primary users (PUs). With the quality-of-service (QoS) requirement

A low‐power 802.11 ad compatible 60‐GHz phase‐locked loop in 65‐nm CMOS

1 min read ·
Hammad M. Cheema, et al., "A low‐power 802.11 ad compatible 60‐GHz phase‐locked loop in 65‐nm CMOS" Microwave and Optical Technology Letters 57 (3), 2015, 660. A 60‐GHz fundamental frequency phase locked loop (PLL) as part of a highly integrated system‐on‐chip transmitter with on‐chip memory and antenna is presented. As a result of localized optimization approach for each component, the PLL core components only consume 30.2 mW from a 1.2 V supply. A systematic design procedure to achieve high phase margin and wide locking range is presented. The reduction of parasitic and fixed capacitance

Wavy Channel TFT-Based Digital Circuits

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Amir N. Hanna, et al., "Wavy Channel TFT-Based Digital Circuits." IEEE Transactions on Electron Devices 63 (4), 2016, 1550. Abstract: We report a wavy channel (WC) architecture thin-film transistor-based digital circuitry using ZnO as a channel material. The novel architecture allows for extending device width by integrating vertical finlike substrate corrugations giving rise to 50% larger device width, without occupying extra chip area. The enhancement in the output drive current is 100%, when compared with conventional planar architecture for devices occupying the same chip area. The current

Statistical Analysis for Memristor Crossbar Memories

1 min read ·
Rawan Naous, et al., "Statistical Analysis for Memristor Crossbar Memories." Int. Journal of Unconventional Computing 12, 2016, 251. The inherent memory capabilities bound with compactness and scalability features pose the memristor as an ideal rival for conventional nonvolatile memories. Its use within a crossbar structure offers high-density storage and tight dimensionality. A fitting parameter in the midst of the trend towards nanoscale integration, where gateless memories are on the rise in an attempt to achieve further space savings. Nonetheless, the gate sacrifice comes at the expense of

Experimental Verification of on Chip CMOS Fractional-Order Capacitor Emulators

1 min read ·
Georgia Tsirimokou, et al., "Experimental verification of on-chip CMOS fractional-order capacitor emulators." Electronics Letters 52 (15) , 2016, 1298. The experimental results from a fabricated integrated circuit of fractional-order capacitor emulators are reported. The chip contains emulators of capacitors of orders 0.3, 0.4, 0.5, 0.6 and 0.7 with nano-Farad pseudo-capacitances that can be adjusted through a bias current. Two off-chip capacitors are used to set the bandwidth of each emulator independently. The chip was designed in Austria microsystems (AMS) 0.35μ CMOS.

Cloaking through cancellation of diffusive wave scattering

1 min read ·
Mohamed Farhat, et al., "Cloaking through cancellation of diffusive wave scattering." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 472, 2016, 20160276. A new cloaking mechanism, which makes enclosed objects invisible to diffusive photon density waves, is proposed. First, diffusive scattering from a basic core–shell geometry, which represents the cloaked structure, is studied. The conditions of scattering cancellation in a quasi-static scattering regime are derived. These allow for tailoring the diffusivity constant of the shell enclosing the object so

Pilot assisted readout for passive memristor crossbars

1 min read ·
Rawan Naous, et al., "Pilot assisted readout for passive memristor crossbars." Microelectronics Journal 54, 2016 48. The high demands for performance and energy efficiency pose significant challenges for computational systems. Memristor-based crossbar architectures are actively considered as vital rivals for the traditional solutions. Nonetheless, density and energy driven passive array structures, that lack a switching control per cell, suffer from sneak paths that limit the range of accurate operation of the crossbar array. In this paper, the crossbar array is treated as a communication

Memristor-based neural networks: Synaptic versus neuronal stochasticity

1 min read ·
Rawan Naous, et al., "Memristor-based neural networks: Synaptic versus neuronal stochasticity." Aip Advances 6, (11), 2016, 111304. In neuromorphic circuits, stochasticity in the cortex can be mapped into the synaptic or neuronal components. The hardware emulation of these stochastic neural networks are currently being extensively studied using resistive memories or memristors. The ionic process involved in the underlying switching behavior of the memristive elements is considered as the main source of stochasticity of its operation. Building on its inherent variability, the memristor is

A light responsive two-component supramolecular hydrogel: a sensitive platform for the fabrication of humidity sensors

1 min read ·
Suman Samai, et al., "A light responsive two-component supramolecular hydrogel: a sensitive platform for the fabrication of humidity sensors." Soft matter 12 (11), 2016, 2842. The supramolecular assembly of anionic azobenzene dicarboxylate and cationic cetyltrimethylammonium bromide (CTAB) formed a stimuli responsive hydrogel with a critical gelation concentration (CGC) of 0.33 wt%. This self-sustainable two-component system was able to repair damage upon light irradiation. Moreover, it was successfully employed in the fabrication of highly sensitive humidity sensors for the first time.

Compatibility analysis of 3D printer resin for biological applications

1 min read ·
Shilpa Siyashankar, et al., "Compatibility analysis of 3D printer resin for biological applications" Micro & Nano Letters, 11 (10), 2016, 654. The salient features of microfluidics such as reduced cost, handling small sample and reagent volumes and less time required to fabricate the devices has inspired the present work. The incompatibility of three-dimensional printer resins in their native form and the method to improve their compatibility to many biological processes via surface modification are reported. The compatibility of the material to build microfluidic devices was evaluated in

Flash μ-fluidics: a rapid prototyping method for fabricating microfluidic devices

1 min read ·
Ulrich Buttner, et al., "Flash μ-fluidics: a rapid prototyping method for fabricating microfluidic devices." Rsc Advances 6 (78), 2016, 74822. Microfluidics has advanced in terms of design and structures; however, fabrication methods are time-consuming or expensive relative to facility costs and equipment needed. This work demonstrates a fast and economically viable 2D/3D maskless digital light-projection method based on a stereolithography process. Unlike other fabrication methods, one exposure step is used to form the whole device. Flash microfluidics is achieved by incorporating bonding and

Matching properties of femtofarad and sub-femtofarad MOM capacitors

1 min read ·
Hesham Omran, et al., "Matching properties of femtofarad and sub-femtofarad MOM capacitors." IEEE Transactions on Circuits and Systems I 63 (6) ,2016, 763. Small metal-oxide-metal (MOM) capacitors are essential to energy-efficient mixed-signal integrated circuit design. However, only few reports discuss their matching properties based on large sets of measured data. In this paper, we report matching properties of femtofarad and sub-femtofarad MOM vertical-field parallel-plate capacitors and lateral-field fringing capacitors. We study the effect of both the finger-length and finger-spacing on

Direct mismatch characterization of femtofarad capacitors

1 min read ·
Hesham Omran, et al., "Direct mismatch characterization of femtofarad capacitors" IEEE Transactions on Circuits and Systems II: Express Briefs 63 (2), 2016, 151. Abstract: Reducing the capacitance of programmable capacitor arrays (PCAs), commonly used in analog integrated circuits, is necessary for low-energy applications. However, limited mismatch data are available for small capacitors. We report mismatch measurement for a 2-fF poly-insulator-poly (PIP) capacitor, which is the smallest reported PIP capacitor to the best of the authors' knowledge. Instead of using complicated custom on-chip

Wide-range adaptive RF-to-DC power converter for UHF RFIDs

1 min read ·
Mahmoud H. Ouda, et al., "Wide-range adaptive RF-to-DC power converter for UHF RFIDs." IEEE Microwave and Wireless Components Letters 26 (8), 2016, 634. A wide-range, differential, cross-coupled rectifier is proposed with an extended dynamic range of input RF power that enables wireless powering from varying distances. The proposed architecture mitigates the reverse-leakage problem in conventional, cross-coupled rectifiers without degrading sensitivity. A prototype is designed for UHF RFID applications, and is implemented using 0.18 μm CMOS technology. On-chip measurements demonstrate a

Single-readout high-density memristor crossbar

1 min read ·
Mohammed A. Zidan, et al., "Single-readout high-density memristor crossbar." Scientific reports 6, 2016, 18863. High-density memristor-crossbar architecture is a very promising technology for future computing systems. The simplicity of the gateless-crossbar structure is both its principal advantage and the source of undesired sneak-paths of current. This parasitic current could consume an enormous amount of energy and ruin the readout process. We introduce new adaptive-threshold readout techniques that utilize the locality and hierarchy properties of the computer-memory system to address the

Stochasticity Modeling in Memristors

1 min read ·
Rawan Naous, et al., "Stochasticity modeling in memristors." IEEE Transactions on Nanotechnology 15 (1), 2016, 15. Abstract: Diverse models have been proposed over the past years to explain the exhibiting behavior of memristors, the fourth fundamental circuit element. The models varied in complexity ranging from a description of physical mechanisms to a more generalized mathematical modeling. Nonetheless, stochasticity, a widespread observed phenomenon, has been immensely overlooked from the modeling perspective. This inherent variability within the operation of the memristor is a vital

Zinc Oxide Integrated Wavy Channel Thin-Film Transistor-Based High-Performance Digital Circuits

1 min read ·
Amir N. Hanna, , et al., "Zinc oxide integrated wavy channel thin-film transistor-based high-performance digital circuits." IEEE Electron Device Letters 37 (2), 2016, 193. Abstract: High-performance thin film transistor (TFT) can be a great driving force for display, sensor/actuator, integrated electronics, and distributed computation for the Internet of Everything applications. While semiconducting oxides, such as zinc oxide (ZnO), present promising opportunity in that regard, still wide area of improvement exists to increase the performance further. Here, we show a wavy channel (WC)

Integration of fractal biosensor in a digital microfluidic platform

1 min read ·
Yousof Mashraei, et al., "Integration of fractal biosensor in a digital microfluidic platform." IEEE Sensors Journal 16 (24), 2016, 8775. Abstract: The digital microfluidic (DMF) platform introduces many applications in biomedical assays. If it is to be commercially available to the public, it needs to have the essential features of smart sensing and a compact size. In this paper, we report on a fractal electrode biosensor that is used for both droplet actuation and sensing C-reactive protein (CRP) concentration levels to assess cardiac disease risk. Our proposed electrode is the first two

Ferroelectric Fractional‐Order Capacitors

1 min read ·
Agamaryat Agambayev, et al., " Ferroelectric Fractional‐Order Capacitors". ChemElectroChem, 4(11), 2017, 2807. Poly(vinylidene fluoride)‐based polymers and their blends are used to fabricate electrostatic fractional‐order capacitors. This simple but effective method allows us to precisely tune the constant phase angle of the resulting fractional‐order capacitor by changing the blend composition. Additionally, we have derived an empirical relationship between the ratio of the blend constituents and the constant phase angle to facilitate the design of a fractional‐order capacitor with a desired

3D‐Printed Disposable Wireless Sensors with Integrated Microelectronics for Large Area Environmental Monitoring

1 min read ·
muhamad F. Farooqui, et al., "3D‐Printed Disposable Wireless Sensors with Integrated Microelectronics for Large Area Environmental Monitoring". Advanced Materials Technologies, 2(8), 2017, 1700051. Large area environmental monitoring can play a crucial role in dealing with crisis situations. However, it is challenging as implementing a fixed sensor network infrastructure over large remote area is economically unfeasible. This work proposes disposable, compact, dispersible 3D‐printed wireless sensor nodes with integrated microelectronics which can be dispersed in the environment and work in

Performance analysis of fractional-order PID controller for a parabolic distributed solar collector

1 min read ·
Shahrazad Elmetennani, et al., " Performance analysis of fractional-order PID controller for a parabolic distributed solar collector". In 2017 IEEE AFRICON, 2017, 440. Abstract: This paper studies the performance of a fractional-order proportional integral derivative (FOPID) controller designed for parabolic distributed solar collectors. The control problem addressed in concentrated solar collectors aims at forcing the produced heat to follow a desired reference despite the unevenly varying solar irradiance. In addition to the unpredictable variations of the energy source, the parabolic solar

Experimental behavior evaluation of series and parallel connected constant phase elements

1 min read ·
Georgia Tsirimokou, et al., "Experimental behavior evaluation of series and parallel connected constant phase elements". AEU-International Journal of Electronics and Communications, 74, 2017, 5. Fractional-order capacitors are the core building blocks for implementing fractional-order circuits. Due to the absence of their commercial availability, they can be approximated through appropriately configured passive or active integer-order element topologies. Such a topology, constructed using Operational Transconductance Amplifiers (OTAs) and capacitors has been implemented in monolithic form

A 33fJ/Step SAR capacitance-to-digital converter using a chain of inverter-based amplifiers

1 min read ·
Hesham Omran, et al., "A 33fJ/Step SAR capacitance-to-digital converter using a chain of inverter-based amplifiers". IEEE Transactions on Circuits and Systems I: Regular Papers, 64(2), 2017, 310. Abstract: A 12 - bit energy-efficient capacitive sensor interface circuit that fully relies on capacitance-domain successive approximation (SAR) technique is presented. Analysis shows that for SAR capacitance-to-digital converter (CDC) comparator offset voltage will result in parasitic-dependent conversion errors, which necessitates using an offset cancellation technique. Based on the presented

Localized surface plate modes via flexural Mie resonances

1 min read ·
Mohamed Farhat, et al., "Localized surface plate modes via flexural Mie resonances". Physical Review B, 95(17), 2017, 174201. Surface-plasmon polaritons are naturally generated upon excitation of metals with high-frequency electromagnetic waves. However, the concept of spoof plasmons has made it possible to generate plasmoniclike effects in microwave electrodynamics, magnetics, and even acoustics. Similarly, in this paper, the concept of localized surface plate modes (SPMs) is introduced. It is demonstrated that SPMs can be generated on a two-dimensional (clamped or stress-free) cylindrical

Fractal electrochemical microsupercapacitors

1 min read ·
Marinal K. Hota, et al., " Fractal electrochemical microsupercapacitors". Advanced Electronic Materials, 3(10), 20171700185. The first successful fabrication of microsupercapacitors (μ‐SCs) using fractal electrode designs is reported. Using sputtered anhydrous RuO2 thin‐film electrodes as prototypes, μ‐SCs are fabricated using Hilbert, Peano, and Moore fractal designs, and their performance is compared to conventional interdigital electrode structures. Microsupercapacitor performance, including energy density, areal and volumetric capacitances, changes with fractal electrode geometry

Self-Biased Differential Rectifier with Enhanced Dynamic Range for Wireless Powering

1 min read ·
Mahmoud H. Ouda, et al., "Self-biased differential rectifier with enhanced dynamic range for wireless powering." IEEE Transactions on Circuits and Systems II: Express Briefs 64, (5), 2017, 515. A self-biased cross-coupled differential rectifier is proposed with enhanced power-conversion efficiency (PCE) over an extended range of input power. A prototype is designed for ultrahigh-frequency (UHF) 433-MHz radio-frequency power-harvesting applications and is implemented using a 0.18-μm CMOS technology. The proposed rectifier architecture is compared with the conventional cross-coupled rectifier

Transparent Flash Memory Using Single Ta2O5 Layer for Both Charge-Trapping and Tunneling Dielectrics

1 min read ·
Mrinal K. Hota, et al., "Transparent Flash Memory Using Single Ta2O5 Layer for Both Charge-Trapping and Tunneling Dielectrics." A CS applied materials & interfaces 9 (26), 2017, 21856. We report reproducible multibit transparent flash memory in which a single solution-derived Ta2O5 layer is used simultaneously as a charge-trapping layer and a tunneling layer. This is different from conventional flash memory cells where two different dielectric layers are typically used. Under optimized programming/erasing operations, the memory device shows excellent programmable memory characteristics with a

Experimental demonstration of fractional-order oscillators of orders 2.6 and 2.7

1 min read ·
Ahmed S. Elwakil, et al., "Experimental demonstration of fractional-order oscillators of orders 2.6 and 2.7". Chaos, Solitons & Fractals, 96, 2017, 160. The purpose of this work is to provide an experimental demonstration for the development of sinusoidal oscillations in a fractional-order Hartley-like oscillator. Solid-state fractional-order electric double-layer capacitors were first fabricated using graphene-percolated P (VDF-TrFE-CFE) composite structure, and then characterized by using electrochemical impedance spectroscopy. The devices exhibit the fractional orders of 0.6 and 0.74

Tunable fractional-order capacitor using layered ferroelectric polymers

1 min read ·
Agamyrat Agambayev, et al. "Tunable fractional-order capacitor using layered ferroelectric polymers." AIP Advances 7 (9), 2017, 095202. Pairs of various Polyvinylidene fluoride P(VDF)-based polymers are used for fabricating bilayer fractional order capacitors (FOCs). The polymer layers are constructed using a simple drop casting approach. The resulting FOC has two advantages: It can be easily integrated with printed circuit boards, and its constant phase angle (CPA) can be tuned by changing the thickness ratio of the layers. Indeed, our experiments show that the CPA of the fabricated FOCs can

A New Design Methodology for Time-Based Capacitance-to-Digital Converters (T-CDCs)

1 min read ·
Ali H. Hassan, et al., "A New Design Methodology for Time-Based Capacitance-to-Digital Converters (T-CDCs)". AEU-International Journal of Electronics and Communications 96, 2018, 238. This paper introduces a 9-bit time-based capacitance-to-digital converter (T-CDC). This T-CDC adopts a new design methodology for parasitic cancellation with a simple calibration technique. In T-CDCs, the input sensor capacitance is first converted into a delay pulse using a capacitance-to-time converter (CTC) circuit; then this delay signal is converted into a digital code through a time-to-digital converter

Electronically tunable fully integrated fractional-order resonator

1 min read ·
Georgia Tsirimokou., et al., "Electronically tunable fully integrated fractional-order resonator". I EEE Transactions on Circuits and Systems II: Express Briefs, 65(2), 2017, 166. A fully integrated implementation of a parallel fractional-order resonator that employs together a fractional-order capacitor and a fractional-order inductor is proposed in this brief. The design utilizes current-controlled operational transconductance amplifiers as building blocks, designed, and fabricated in AMS 0.35-μm CMOS process and based on a second-order approximation of a fractional-order differentiator

Experimental Verification of a Fractional-Order Wien Oscillator Built Using Solid-State Capacitors

1 min read ·
Kartci, Aslihan, et al. "Experimental Verification of a Fractional-Order Wien Oscillator Built Using Solid-State Capacitors." 2018 IEEE 61st International Midwest Symposium on Circuits and Systems (MWSCAS). IEEE, 2018, 544. A new type of fractional-order capacitors (FOCs) is fabricated using a molybdenum disulfide (MoS 2 )-ferroelectric polymer composite. The phase angle of this FOC's impedance remains constant between 100 Hz and 10MHz with only a small deviation of ±4 degrees. The performance of the fabricated FOCs is further tested using the well-known Wien oscillator. The main motivation of

An ultra-broadband single-component fractional-order capacitor using MoS2-ferroelectric polymer composite

1 min read ·
Agamyrat Agambayev, et al., "An ultra-broadband single-component fractional-order capacitor using MoS2-ferroelectric polymer composite". Applied Physics Letters, 113(9),2018, 093505. The phase angle of a fractional-order capacitor's (FOC) impedance has a constant value between −90°−90° and 0°0°. Maintaining this value over a broad frequency band is of utmost importance since it increases the applicability of the electrical circuit that employs the fractional-order capacitor (FOC). In this work, a molybdenum disulfide (MoS2)-ferroelectric polymer composite is used to design/fabricate an FOC

ASIC oriented comparative analysis of biologically inspired neuron models

1 min read ·
El-Maksoud, Ahmed J. Abd, et al. "ASIC oriented comparative analysis of biologically inspired neuron models." 2018 IEEE 61st International Midwest Symposium on Circuits and Systems (MWSCAS). IEEE, 2018, 504. This paper introduces the hardware and the ASIC implementations of the four most popular biologically inspired neuron models. The models are quartic, Izhikevich, Hindmarsh Rose and Fitzhugh-Nagumo. Moreover, some approximate computing techniques are applied on these models to reduce the area and power consumption. In addition, ASIC implementations of these models and their approximate

CMOS-RC Colpitts oscillator design using floating fractional-order inductance simulator

1 min read ·
Kartci, Aslihan, et al. "CMOS-RC Colpitts oscillator design using floating fractional-order inductance simulator." IEEE 61st International Midwest Symposium on Circuits and Systems (MWSCAS). IEEE, 2018, 905. This paper deals with CMOS fractional-order inductance (FoL) simulator design and its utilization in 2.75 th order Colpitts oscillator providing high frequency of oscillation. The proposed floating FoL is composed of two unity-gain current followers (CF±s), two inverting voltage buffers, a transconductor, and a fractional-order capacitor (FoC) of order 0.75, while the input intrinsic

A Comparative Study of Interdigitated Electrode and Quartz Crystal Microbalance Transduction Techniques for Metal–Organic Framework-Based Acetone Sensors

1 min read ·
Chappanda N. Karumbaiah, et al., "A Comparative Study of Interdigitated Electrode and Quartz Crystal Microbalance Transduction Techniques for Metal–Organic Framework-Based Acetone Sensors". Sensors 18(11), 2018, 3898. We present a comparative study of two types of sensor with different transduction techniques but coated with the same sensing material to determine the effect of the transduction mechanism on the sensing performance of sensing a target analyte. For this purpose, interdigitated electrode (IDE)-based capacitors and quartz crystal microbalance (QCM)-based resonators were coated with

Guest Editorial: Special Issue on Large-Scale Memristive Systems and Neurochips for Computational Intelligence

1 min read ·
Alex Pappachen James, et al., "Guest Editorial: Special Issue on Large-Scale Memristive Systems and Neurochips for Computational Intelligence". IEEE Transactions on Emerging Topics in Computational Intelligence, 2(5), 2018, 320. Abstract: The papers in this special section explore the use of large scale memristive systems and neurochips for computational intelligence. The interest in the application of memristor device as a memory element, neuromorphic device, as a sensor and as a switch for programmable logic circuits has been growing in the last decade. The small size, ease of

An approximate multiplier based hardware implementation of the izhikevich model

1 min read ·
Hassan, Salma, et al., "An approximate multiplier based hardware implementation of the izhikevich model." IEEE 61st International Midwest Symposium on Circuits and Systems (MWSCAS). IEEE, 2018, 492. This paper proposes the use of approximate multipliers in the hardware implementation of Izhikevich spiking neuron model. The accuracy of the model is investigated by calculating various types of errors on a single neuron and this analysis shows that the proposed model follows the original model. It shows that the proposed model reproduces the same firing patterns as the original one. The network

Analog backpropagation learning circuits for memristive crossbar neural networks

1 min read ·
Krestinskaya, Olga, "Analog backpropagation learning circuits for memristive crossbar neural networks." 2018 IEEE International Symposium on Circuits and Systems (ISCAS). IEEE, 2018, 1. The implementation of backpropagation algorithm using gradient descent operation with analog circuits is an open problem. In this paper, we present the analog learning circuits for realizing backpropagation algorithm for use with neural networks in memristive crossbar arrays. The circuits are simulated in SPICE using TSMC 180nm CMOS process models, and HP memristor models. The gradient descent operations are

Fully printed 3D cube-shaped multiband fractal rectenna for ambient RF energy harvesting

1 min read ·
Azamat Bakytbekov, A, et al., "Fully printed 3D cube-shaped multiband fractal rectenna for ambient RF energy harvesting". Nano energy, 53, 2018, 587. The Internet of Things (IoT) is an emerging paradigm that requires billions of wirelessly connected devices in a complex radio-frequency (RF) environment. With such a huge number of devices in this scenario, recharging or replacing batteries becomes impractical. Therefore, powering IoT devices by harvesting energy from ambient sources, such as that available in the RF spectrum, is an attractive solution. The antenna for the RF energy harvester

Towards fractional-order capacitors with broad tunable constant phase angles: Multi-walled carbon nanotube-polymer composite as a case study

1 min read ·
Agamyrat Agambayev, et al., "Towards fractional-order capacitors with broad tunable constant phase angles: Multi-walled carbon nanotube-polymer composite as a case study." Journal of Physics D: Applied Physics 51(6), 2018, 065602. In this study, multi-walled carbon nanotube (MWCNT) filled polyevinelidenefluoride-trifluoroethylene-chlorofluoroethylene composites are used to realize fractional-order capacitors (FOCs). A solution-mixing and drop-casting approach is used to fabricate the composite. Due to the high aspect ratio of MWCNTs, percolation regime starts at a small weight percentage (wt%)

Fractional-Order Hartley Oscillator.

1 min read ·
Agambayev, A., et al., "Fractional-Order Hartley Oscillator". PRIME, 2018, 45. A fractional-order capacitor (FOC) is developed using a Molybdenum disulfide ferroelectric polymer composite. The fabricated FOC exhibits constant phase over five decades between 100 Hz-10 MHz, which is the broadest operating frequency bandwidth reported so far for an FOC. Furthermore, a fractional-order Hartley oscillator is built using this FOC, and provide ten times higher oscillation frequency than the frequency of the conventional Hartley oscillator counterpart.

Learning in Memristive Neural Network Architectures Using Analog Backpropagation Circuits

1 min read ·
Olga Krestinskaya, et al., "Learning in Memristive Neural Network Architectures Using Analog Backpropagation Circuits" IEEE Transactions on Circuits and Systems-I 66 (2), 2019, 719. The on-chip implementation of learning algorithms would speed up the training of neural networks in crossbar arrays. The circuit level design and implementation of a back-propagation algorithm using gradient descent operation for neural network architectures is an open problem. In this paper, we propose analog backpropagation learning circuits for various memristive learning architectures, such as deep neural

Approximate Computing With Stochastic Transistors’ Voltage Over-Scaling

1 min read ·
Ren Li, et al., "Approximate Computing With Stochastic Transistors’ Voltage Over-Scaling" IEEE Access 7, 2019, 6373. Ubiquitous computing and the ever-rising need for energy efficiency pose challenges in terms of the processing requirements and the corresponding machine complexity. Nonetheless, the nature of the underlying applications, particularly dealing with real-world data, offers alternative paradigms toward the efficient utilization of the available design resources. In this paper, approximate computing is addressed as an accommodating technique that can benefit from the inherent

Low-Power Hardware Implementation of a Support Vector Machine Training and Classification for Neural Seizure Detection

1 min read ·
Heba Elhosary, et al., "Low-Power Hardware Implementation of a Support Vector Machine Training and Classification for Neural Seizure Detection." IEEE Transactions on Biomedical Circuits and Systems 13 (6), 2019, 1324. In this paper, a low power support vector machine (SVM) training, feature extraction, and classification algorithm are hardware implemented in a neural seizure detection application. The training algorithm used is the sequential minimal optimization (SMO) algorithm. The system is implemented on different platforms: such as field programmable gate array (FPGA), Xilinx Virtex-7 and

Scattering Cancellation-based Cloaking for the Maxwell-Cattaneo Heat Waves

1 min read ·
Mohamed Farhat, et al., "Scattering Cancellation-based Cloaking for the Maxwell-Cattaneo Heat Waves". Physical Review Applied, 11(4), 2019, 044089. We theoretically propose scattering cancellation-based cloaks for heat waves that obey the Maxwell-Cattaneo equation. The proposed cloaks possess carefully tailored diffusivity to cancel the dipole scattering from the object that they surround, and thus can render a small object invisible in the near and far fields, as demonstrated by full-wave finite-element simulations. Mantle heat cloaking is further analyzed and proposed to simplify the design

Synthesis and Optimization of Fractional-order Elements Using a Genetic Algorithm

1 min read ·
Aslihan Kartci, et al., "Synthesis and Optimization of Fractional-order Elements Using a Genetic Algorithm". IEEE Access 7, 2019, 80233. This study proposes a new approach for the optimization of phase and magnitude responses of fractional-order capacitive and inductive elements based on the mixed integer-order genetic algorithm (GA), over a bandwidth of four-decade, and operating up to 1 GHz with a low phase error of approximately ±1 ◦ . It provides a phase optimization in the desired bandwidth with minimal branch number and avoids the use of negative component values, and any complex

FPGA Implementation of Dynamically Reconfigurable IoT security Module Using Algorithm Hopping

1 min read ·
Shady Soliman, et al., "FPGA Implementation of Dynamically Reconfigurable IoT security Module Using Algorithm Hopping." Integration 68, 2019, 108. Internet of Things (IoT) is a promising technology that is continuously spreading around the world leading to many challenges facing cryptographic designers who are trying to fulfill the security standards of IoT constrained devices. In this work, a new design is proposed that adds a new dimension of security by using the concept of frequency hopping to generate a pseudo-random pattern for switching between 5 lightweight cryptographic ciphers: AEGIS

An Imperceptible Magnetic Skin

1 min read ·
Abdullah S Almansouri, et al., "An Imperceptible Magnetic Skin." Advanced Materials Technologies 4 (10), 2019, 1900493. Flexible and wearable magnetoelectronics add intriguing new functionalities to natural perception. Of particular interest regarding these artificial skins are wireless sensing and touchless interactions. Biocompatibility and imperceptibility are the most significant features of devices attached to the bodies. A biocompatible magnetic skin is introduced. It offers extreme flexibility, stretchability (>300%), and is lightweight, while maintaining a remanent magnetization up to

An Ultra-Area-Efficient 1024-Point In-Memory FFT Processor

1 min read ·
Hasan E. Yantir, et al., "An Ultra-Area-Efficient 1024-Point In-Memory FFT Processor", Micromachines, 10 (8), 2019, 509. Current computation architectures rely on more processor-centric design principles. On the other hand, the inevitable increase in the amount of data that applications need forces researchers to design novel processor architectures that are more data-centric. By following this principle, this study proposes an area-efficient Fast Fourier Transform (FFT) processor through in-memory computing. The proposed architecture occupies the smallest footprint of around 0.1 mm2 inside

Scattering Theory of Gravity-Flexural Waves of Floating Plates on Water

1 min read ·
Mohamed Farhat, et al., "Scattering Theory of Gravity-Flexural Waves of Floating Plates on Water". arXiv preprint arXiv:1901.09733. Phys. Rev. B 101, 2019, 014307. We combine theories of scattering for linearized water waves and flexural waves in thin plates to characterize and achieve control of water wave scattering using floating plates. This requires manipulating a sixth-order partial differential equation with appropriate boundary conditions of the velocity potential. Making use of multipole expansions, we reduce the scattering problem to a linear algebraic system. The response of a

A Comparison of Artificial Neural Network (ANN) and Support Vector Machine (SVM) Classifiers for Neural Seizure Detection

1 min read ·
Elgammal, M, et al., "A Comparison of Artificial Neural Network (ANN) and Support Vector Machine (SVM) Classifiers for Neural Seizure Detection". IEEE 62nd International Midwest Symposium on Circuits and Systems (MWSCAS) 2019, 646. In this paper, two different classifiers are software and hardware implemented for neural seizure detection. The two techniques are support vector machine(SVM) and artificial neural networks(ANN). The two techniques are pretrained on software and only the classifiers are hardware implemented and tested. A comparison of the two techniques is performed on the levels

A Precision, Energy-Efficient, Oversampling, Noise-Shaping Differential SAR Capacitance-to-Digital Converter

1 min read ·
Abdulaziz Alhoshany, et al., "A Precision, Energy-Efficient, Oversampling, Noise-Shaping Differential SAR Capacitance-to-Digital Converter" IEEE Transactions on Instrumentation and Measurement, 68 (2), 2019, 392. This paper introduces an oversampling, noise-shaping differential successive-approximation-register capacitance-to-digital converter (CDC) architecture for interfacing capacitive sensors. The proposed energy-efficient CDC achieves high-precision capacitive resolution by employing oversampling and noise shaping. The switched-capacitor (SC) integrator is inserted between the comparator

Photo-carrier Extraction by Triboelectricity for Carrier Transport Layer-free Photodetectors

1 min read ·
Vincent K. S. Hsiao, et al., "Photo-carrier Extraction by Triboelectricity for Carrier Transport Layer-free Photodetectors." Nano Energy 65, 2019, 103958. Efficient carrier extraction is essential for high performance optoelectronic devices, such as solar cells and photodetectors. Conventional strategies to separate photogenerated carriers typically involve the fabrication of a p-n junction by doping and the use of carrier selective charge transport layers. However, these techniques often require high temperature processes or costly materials. In this work, we demonstrate an innovative and

Blue Energy Fuels: Converting Ocean Wave Energy to Carbon-based Liquid Fuels via CO2 Reduction

1 min read ·
Siu-Fung Leung, et al., "Blue Energy Fuels: Converting Ocean Wave Energy to Carbon-based Liquid Fuels via CO2 Reduction." Energy & Environmental Science, 2020. Sequestering CO2 in the form of carbon-based liquid fuels would provide both a convenient and sustainable form of energy for practical use as well as mitigate the effects of global warming and climate change. Ocean wave energy is an abundant and relatively stable source of renewable energy, which would be highly desirable for the conversion of CO2 to conveniently stored and transported liquid fuels. In this work, we demonstrate a wave

A Self-Powered Magneto-Acoustic Tracking Transducer

1 min read ·
Almansouri, Abdullah S., et al. "A Self-Powered Magneto-Acoustic Tracking Transducer." (2020). Acoustic telemetry is widely used for many tracking applications. Objects or subjects are tracked by attaching an acoustic transmitter onto them or having them wear them. The acoustic signal is then detected by different microphones to determine the location of the tagged target. The size and the weight of the tag determine the size of the target that can be tracked. In the case of small-sized tags, about 80% of the volume is consumed by the battery and electronics, while less than 20% by the actual

Spectrometer-Free Graphene Plasmonics Based Refractive Index Sensor

1 min read ·
Li Zhang, et al., "Spectrometer-Free Graphene Plasmonics Based Refractive Index Sensor." Sensors 20 (8), 2020, 2347. We propose a spectrometer-free refractive index sensor based on a graphene plasmonic structure. The spectrometer-free feature of the device is realized thanks to the dynamic tunability of graphene’s chemical potential, through electrostatic biasing. The proposed sensor exhibits a 1566 nm/RIU sensitivity, a 250.6 RIU− 1 figure of merit in the optical mode of operation and a 713.2 meV/RIU sensitivity, a 246.8 RIU− 1 figure of merit in the electrical mode of operation. This

Scattering theory and cancellation of gravity-flexural waves of floating plates

1 min read ·
Mohamed Farhat, et al., "Scattering theory and cancellation of gravity-flexural waves of floating plates." Physical Review B, 101 (1), 2020, 014307. We combine theories of scattering for linearized water waves and flexural waves in thin elastic plates to characterize and achieve control of water wave scattering using floating plates. This requires manipulating a sixth-order partial differential equation with appropriate boundary conditions of the velocity potential. Making use of multipole expansions, we reduce the scattering problem to a linear algebraic system. The response of a floating

Toward Self-Powered Internet of Underwater Things Devices

1 min read ·
Jose de Oliveira, et al., "Toward Self-Powered Internet of Underwater Things Devices." IEEE Communications Magazine 58 (1), 2020, 68. Exploiting light beams to carry information and deliver power is suggested as a potential technology to recharge batteries in future generations of IoT and IoUT devices while providing optical connectivity. SLIPT has been recently proposed as an efficient method of wireless power transfer between communicating terminals. In this article, we provide an overview of the various SLIPT techniques in the time, power, and space domains. We also demonstrate two SLIPT

A Dual-Mode Nested Rectifier for Ambient Wireless Powering in CMOS Technology

1 min read ·
Abdullah Almansouri, et al., "A Dual-Mode Nested Rectifier for Ambient Wireless Powering in CMOS Technology." IEEE Transactions on Microwave Theory and Techniques, 68 (5) , 2020, 1754. This article proposes (DM) nested radio frequency (RF) rectifier for ambient wireless powering. The proposed architecture utilizes a DM nested feedback circuit to enhance the conductivity of the rectifier at low power while reducing the reverse leakage current at high power by generating supply voltages at the gates of the pMOS rectifying transistors. The proposed rectifier is fabricated in a 65-nm CMOS

Fully Transparent Transceiver Using Single Binary Oxide Thin Film Transistors

1 min read ·
Ali Hassan, et al., "Fully Transparent Transceiver Using Single Binary Oxide Thin Film Transistors." Advanced Electronic Materials 6, 2020, 1901083. Using one binary oxide, a fully transparent thin‐film transistor (TFT)‐based transceiver circuit is presented. The proposed transceiver circuit is fabricated entirely using an atomic layer deposition process. Moreover, the proposed circuit presents two modulation schemes: frequency shift keying and ON/OFF keying. The fabricated TFTs exhibit saturation mobility, threshold voltage, a subthreshold swing, and an ON/OFF ratio of 18.2 cm 2 V− 1 s− 1, 0

Ultra miniaturized InterDigitated electrodes platform for sensing applications

1 min read ·
Z. Wang, et al., "Ultra miniaturized InterDigitated electrodes platform for sensing applications." Microelectronic Engineering 225, 2020, 111253. InterDigitated Electrodes (IDEs) is a generic platform for a wide range of diverse applications with their implementation in sensing modules being a major one. We propose the use of IDCs with deep sub-micron critical dimension; equally spaced electrodes of 200 nm width for enhanced sensing performance and also the method of fabrication thereof. The transducer configuration was studied theoretically with a finite element method simulation by using

EANN: Energy Adaptive Neural Networks

1 min read ·
Salma Hassan, et al., "EANN: Energy Adaptive Neural Networks." Electronics 9 (5), 2020, 746. This paper proposes an Energy Adaptive Feedforward Neural Network (EANN). It uses multiple approximation techniques in the hardware implementation of the neuron unit. The used techniques are precision scaling, approximate multiplier, computation skipping, neuron skipping, activation function approximation and truncated accumulation. The proposed EANN system applies the partial dynamic reconfiguration (PDR) feature supported by the FPGA platform to reconfigure the hardware elements of the neural network

Simplified Modal‐Cancellation Approach for Substrate‐Integrated‐Waveguide Narrow‐Band Filter Design

1 min read ·
Sebastian Celis, et al., "Simplified Modal-Cancellation Approach for Substrate-Integrated-Waveguide Narrow-Band Filter Design". Electronics 2020, 9, 962. Current substrate-integrated-waveguide (SIW) filter design methodologies can be extremely computational and time-inefficient when a narrow-band filter is required. A new approach to designing compact, highly selective narrow-band filters based on smartly positioned obstacles is thus presented here. The proposed modal-cancellation approach is achieved by translating or eliminating undesired modes within the frequency of interest. This is

Organic Field-Effect Transistor-Based Flexible Sensors

1 min read ·
Saravanan Yuvaraja et al., "Organic Field-Effect Transistor-Based Flexible Sensors" Chemical Society Reviews 2020, (Advanced Article). (12) 49, 2020, 3423. Flexible electronic devices have attracted a great deal of attention in recent years due to their flexibility, reduced complexity and lightweight. Such devices can conformably attach themselves to any bendable surface and can possess diverse transduction mechanisms. Consequently, with continued emphasis on innovation and development, major technological breakthroughs have been achieved in this area. This review focuses on the advancements

Towards Efficient Neuromorphic Hardware: Unsupervised Adaptive Neuron Pruning

1 min read ·
Wenzhe Guo, et al., "Towards Efficient Neuromorphic Hardware: Unsupervised Adaptive Neuron Pruning". Electronics 9, 2020, 1059. To solve real-time challenges, neuromorphic systems generally require deep and complex network structures. Thus, it is crucial to search for effective solutions that can reduce network complexity, improve energy efficiency, and maintain high accuracy. To this end, we propose unsupervised pruning strategies that are focused on pruning neurons while training in spiking neural networks (SNNs) by utilizing network dynamics. The importance of neurons is determined by the

Efficient Acceleration of Stencil Applications through In-Memory Computing

1 min read ·
Hasan Yantır, et al., "Efficient Acceleration of Stencil Applications through In-Memory Computing". Micromachines 11, 2020, 622. The traditional computer architectures severely suffer from the bottleneck between the processing elements and memory that is the biggest barrier in front of their scalability. Nevertheless, the amount of data that applications need to process is increasing rapidly, especially after the era of big data and artificial intelligence. This fact forces new constraints in computer architecture design towards more data-centric principles. Therefore, new paradigms such as in

Automating Analogue AI Chip Design with Genetic Search

1 min read ·
Olga Krestinskaya, et al., "Automating Analogue AI Chip Design with Genetic Search" Adv. Intell. Syst, 2000075, 2020, 2. Optimization of analogue neural circuit designs is one of the most challenging, complicated, time‐consuming, and expensive tasks. Design automation of analogue neuromemristive chips is made difficult by the need to design chips at low cost, ease of scaling, high‐energy efficiency, and small on‐chip area. The rapid progress in edge AI computing applications generates high demand for developing smart sensors. The integration of high‐density analogue computing AI chips as

Growth of large-scale MoS2 nanosheets on double layered ZnCo2O4 for real-time in-situ H2S monitoring in live cells

1 min read ·
Mani Veerappan et al., "Growth of large-scale MoS2 nanosheets on double layered ZnCo2O4 for real-time in-situ H2S monitoring in live cells"Journal of Materials Chemistry B, 2020, 1. There is an urgent need to develop in-situ sensors that monitor the continued release of H2S from biological systems to understand H2S-related pathology and pharmacology. For this purpose, we have developed a molybdenum disulfide supported double-layered zinc cobaltite modified carbon cloth electrode (MoS2–ZnCo2O4–ZnCo2O4) based electrocatalytic sensor. The results of our study suggest that the MoS2–ZnCo2O4–ZnCo2O4

Multi‐source ambient energy harvester based on RF and thermal energy: Design, testing, and IoT application

1 min read ·
Azamat Bakytbekov, et al., "Multi‐source ambient energy harvester based on RF and thermal energy: Design, testing, and IoT application." Energy Science & Engineering, 2020,1. Billions of wireless sensing devices must be powered for IoT applications. Collecting energy from the ambient environment to power sensor nodes is a promising solution. Solar energy has been one of the main sources of ambient energy due to its availability, higher power density, and the maturity of the solar photovoltaic industry. However, there are many scenarios (indoor environment, outdoor environment during nighttime

A multi-bit fully integrated thin-film transistor NO2 gas detector at room temperature

1 min read ·
Mani Teja, et al., “A multi-bit fully integrated thin-film transistor NO2 gas detector at room temperature”, IEEE sensor letters 4 (8), 2020, 5501204. Inexpensive and compact gas sensing systems are indispensable for accurate air quality monitoring with broad spatial coverage. We report an InGaZnO thin-film transistor (TFT)-based integrated NO 2 gas detection system that yields a digital output proportional to the NO 2 concentration. This is the first report on integrated TFT-based detectors where gas concentration is quantified and where simultaneous digital output is provided without

Numerical modeling for terahertz testing of non-metallic pipes

1 min read ·
Mohammed Farhat et al., "Numerical modeling for terahertz testing of non-metallic pipes" AIP Advances 10, 2020, 095112. In the oil and gas industry, safety and operational efficiency at production sites are of paramount importance. A reliable non-destructive testing technology for non-metallic pipes has a high potential financial impact, since it may facilitate the replacement of metallic pipes with non-metallic ones. This article features a perspective and future trends in the field of terahertz sensing technology. Importantly, several numerical simulations that illustrate many exciting

Polarization Insensitive and Transparent Frequency Selective Surface for Dual Band GSM Shielding

1 min read ·
Yiming Yang, et al., "Polarization Insensitive and Transparent Frequency Selective Surface for Dual Band GSM Shielding." IEEE Transactions on Antennas and Propagation, 2020 This paper proposes a single-layer, dual-band, optically transparent frequency selective surface (FSS) for GSM shielding. The design evolves from a fractal cross dipole to achieve dual band response, polarization insensitivity and wide angle of incidence stability with a miniaturized size. A two-axis symmetric structure helps to provide a stable frequency response for incident waves with different polarization angles up to

Rail-to-rail complementary input StrongARM comparator for low-power applications

1 min read ·
Mohammed Al Qadasi., et al. "Rail-to-rail complementary input StrongARM comparator for low-power applications." IET Circuits, Devices & Systems, 2020. This study proposes a new scheme for rail-to-rail input StrongARM latch comparator. Additional differential input p-type metal-oxide-semiconductor (PMOS) and cross-coupled n-type metal-oxide-semiconductor (NMOS) transistors have been introduced to achieve the rail-to-rail input range. The proposed scheme offers low-energy consumption of 15.2 fJ and a high speed of 3 GHz, which makes it attractive for energy harvested Internet of Thing

Unsupervised adaptive weight pruning for energy-efficient neuromorphic systems Frontiers in Neuroscience, section Neuromorphic Engineering.

1 min read ·
Wenzhe Guo, et al., "Unsupervised Adaptive Weight Pruning for Energy-Efficient Neuromorphic Systems." Frontiers in Neuroscience 14, 2020, 1189. To tackle real-world challenges, deep and complex neural networks are generally used with a massive number of parameters, which require large memory size, extensive computational operations, and high energy consumption in neuromorphic hardware systems. In this work, we propose an unsupervised online adaptive weight pruning method that dynamically removes non-critical weights from a spiking neural network (SNN) to reduce network complexity and improve
<> Biosensors (43)
Montserrat Ramirez de Angel receiving the Best Pitch Award at IEEE 2024 Sensors Conference

A voice to the voiceless: Montserrat Ramirez De Angel takes “Best Pitch” award at IEEE 2024 Sensors Conference

3 min read ·
Montserrat Ramirez de Angel wins the Best Pitch Award at IEEE 2024 Sensors Conference for her innovative work in biosensors and sensor technology.

KAUST Research Conference 2019: New Trends in Biosensors and Bioelectronics

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KAUST

The “KAUST Research Conference on New Trends in Biosensors and Bioelectronics” aims to give an overview of the most recent efforts in bioelectronics that tackle the “interface” problem and overcome the limits of the current technologies by generating new materials/architectures/device components. With its truly interdisciplinary nature, this conference will bring scientists from different disciplines together.

BioChips: Leveraging Integrated Electronics for Sensing, Medicine, and Science

Pamela Abshire, Professor, Department of Electrical and Computer Engineering and Institute for Systems Research at the University of Maryland, College Park

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B9 L2 R2322

This talk will provide a brief overview of LoCMOS systems, the technologies used to construct them, and their application to novel applications in biosensing, medical diagnostics, and neuroscience. The integration of integrated circuits into LoCMOS devices poses a number of distinct and vexing challenges, increasing complexity while reducing the need for external instrumentation.

Flexible low-cost cardiovascular risk marker biosensor for point-of-care applications

1 min read ·
Shilpa Sivashankar, et al., "Flexible low-cost cardiovascular risk marker biosensor for point-of-care applications." Electronics Letters 51 (22), 2015, 1746. Abstract: The detection and quantification of protein on a laser written flexible substrate for point-of-care applications are described. A unique way of etching gold on polyethylene terephthalate (PET) substrate is demonstrated by reducing the damage that may be caused on PET sheets otherwise. On the basis of the quantity of the C-reactive protein (CRP) present in the sample, the risk of cardiac disease can be assessed. This hsCRP test

Ocean One: A Robotic Avatar for Oceanic Discovery

1 min read ·
Oussama Khatib, et al., "Ocean one: A robotic avatar for oceanic discovery." IEEE Robotics & Automation Magazine 23 (4), 2016, 20. The promise of oceanic discovery has long intrigued scientists and explorers, whether with the idea of studying underwater ecology and climate change or with the hope of uncovering natural resources and historic secrets buried deep in archaeological sites. This quest to explore the oceans requires skilled human access, yet much of the oceans are inaccessible to human divers; nearly ninetenths of the ocean floor is at 1 km or deeper . Accessing these depths is

A “Twisted” Microfluidic Mixer with “Turbulent” Fluidic Flow for Wide Range of Flowrate Applications

1 min read ·
Sivashankar Shilpa, et al., "A “Twisted” Microfluidic Mixer with “Turbulent” Fluidic Flow for Wide Range of Flowrate Applications." Biomicrofluidics 10, 2016, 034120. This paper proposes a new “twisted” 3D microfluidic mixer fabricated by a laser writing/microfabrication technique. Effective and efficient mixing using the twisted micromixers can be obtained by combining two general chaotic mixing mechanisms: splitting/recombining and chaotic advection. The lamination of mixer units provides the splitting and recombination mechanism when the quadrant of circles is arranged in a two-layered

Integration of fractal biosensor in a digital microfluidic platform

1 min read ·
Yousof Mashraei, et al., "Integration of fractal biosensor in a digital microfluidic platform." IEEE Sensors Journal 16 (24), 2016, 8775. Abstract: The digital microfluidic (DMF) platform introduces many applications in biomedical assays. If it is to be commercially available to the public, it needs to have the essential features of smart sensing and a compact size. In this paper, we report on a fractal electrode biosensor that is used for both droplet actuation and sensing C-reactive protein (CRP) concentration levels to assess cardiac disease risk. Our proposed electrode is the first two

Bio‐Inspired Carbon Monoxide Sensors with Voltage‐Activated Sensitivity

1 min read ·
Savagatrup Suchol, et al. "Bio‐Inspired Carbon Monoxide Sensors with Voltage‐Activated Sensitivity." Angewandte Chemie 129 (45) ,2017, 14254. Carbon monoxide (CO) outcompetes oxygen when binding to the iron center of hemeproteins, leading to a reduction in blood oxygen level and acute poisoning. Harvesting the strong specific interaction between CO and the iron porphyrin provides a highly selective and customizable sensor. We report the development of chemiresistive sensors with voltage‐activated sensitivity for the detection of CO comprising iron porphyrin and functionalized single‐walled

A biosensor-CMOS platform and integrated readout circuit in 0.18-μm CMOS technology for cancer biomarker detection

1 min read ·
Abdulaziz Alhoshany, et al., " A biosensor-CMOS platform and integrated readout circuit in 0.18-μm CMOS technology for cancer biomarker detection". Sensors, 17(9), 2017, 1942. This paper presents a biosensor-CMOS platform for measuring the capacitive coupling of biorecognition elements. The biosensor is designed, fabricated, and tested for the detection and quantification of a protein that reveals the presence of early-stage cancer. For the first time, the spermidine/spermine N1 acetyltransferase (SSAT) enzyme has been screened and quantified on the surface of a capacitive sensor. The sensor

Biofunctionalized Two-dimensional Ti3C2 MXenes for Ultrasensitive Detection of Cancer Biomarker

1 min read ·
Saurabh Kumar, et al., "Biofunctionalized Two-dimensional Ti3C2 MXenes for Ultrasensitive Detection of Cancer Biomarker". Biosensors and Bioelectronics, 121, 2018, 243. In this work, ultrathin Ti3C2-MXene nanosheets were synthesized by minimally intensive layer delamination methods, and uniformly functionalized with aminosilane (f-Ti3C2-MXene) to provide a covalent binding for the immobilized bio-receptor (anti-CEA) for label free, ultrasensitive detection of cancer biomarker (carcinoembryonic antigen, CEA). The effect of different redox probes on the electrochemical behavior of f-Ti3C2-MXene

A fully inkjet-printed disposable glucose sensor on paper

1 min read ·
Eloise Bihar, et al., "A fully Inkjet-printed Disposable Glucose Sensor on Paper". NPJ Flexible Electronics, 2(1), 2018, 1. Inexpensive and easy-to-use diagnostic tools for fast health screening are imperative, especially in the developing world, where portability and affordability are a necessity. Accurate monitoring of metabolite levels can provide useful information regarding key metabolic activities of the body and detect the concomitant irregularities such as in the case of diabetes, a worldwide chronic disease. Today, the majority of daily glucose monitoring tools rely on piercing the

ASIC oriented comparative analysis of biologically inspired neuron models

1 min read ·
El-Maksoud, Ahmed J. Abd, et al. "ASIC oriented comparative analysis of biologically inspired neuron models." 2018 IEEE 61st International Midwest Symposium on Circuits and Systems (MWSCAS). IEEE, 2018, 504. This paper introduces the hardware and the ASIC implementations of the four most popular biologically inspired neuron models. The models are quartic, Izhikevich, Hindmarsh Rose and Fitzhugh-Nagumo. Moreover, some approximate computing techniques are applied on these models to reduce the area and power consumption. In addition, ASIC implementations of these models and their approximate

Memristor-based Synaptic Sampling Machines

1 min read ·
Dolzhikova, I, et al., "Memristor-based Synaptic Sampling Machines. In 2018 IEEE 18th International Conference on Nanotechnology (IEEE-NANO), 2018, 425. Synaptic Sampling Machine (SSM) is a type of neural network model that considers biological unreliability of the synapses. We propose the circuit design of the SSM neural network which is realized through the memristive-CMOS crossbar structure with the synaptic sampling cell (SSC) being used as a basic stochastic unit. The increase in the edge computing devices in the Internet of things era, drives the need for hardware acceleration for data

Deposition of nanomaterials: a crucial step in biosensor fabrication

1 min read ·
Ahmed Rafiq , et al., "Deposition of Nanomaterials: a Crucial Step in Biosensor Fabrication". Materials Today Communications 17, 2018, 289. Biosensor development includes the deposition of (nano)materials onto a conductive electrode surface, which is a crucial step for obtaining improved performance from the constructed biosensors. Various methods have been used to create a successful matrix of (nano)materials that ensures proper contact between the material and electrode surface. The purpose of (nano)material deposition is to provide a high surface area to improve the electroanalytical

Linear and nonlinear feature extraction for neural seizure detection

1 min read ·
Elgammal, M. et al., "Linear and nonlinear feature extraction for neural seizure detection" In 2018 IEEE 61st International Midwest Symposium on Circuits and Systems (MWSCAS), 2018, 795. In this paper, both linear and nonlinear features have been reviewed with linear support vector machine (SVM) classifier for neural seizure detection. The work introduced in the paper includes performance measurement through different metrics: accuracy, sensitivity, and specificity of multiple linear and nonlinear features with linear support vector machine (SVM). A comparison is performed between the

Analysis and verification of identical-order mixed-matrix fractional-order capacitor networks

1 min read ·
Kartci, Aslihan, et al"Analysis and verification of identical-order mixed-matrix fractional-order capacitor networks." In 2018 14th Conference on Ph. D. Research in Microelectronics and Electronics (PRIME), 2018, 277. In the open literature while capacitors are introduced with -90 degrees phase angle, here we described our fabricated polymer composite, mixed matrix, as a fractional- order capacitor (FoC). The effect on phase and pseudo- capacitance using a detailed numerical and experimental study of circuit network connections of three identical-order FoCs is shown. The used devices have

Magneto-Acoustic Resonator for Aquatic Animal Tracking

1 min read ·
Abdullah S. Almansouri, et al., "Magneto-Acoustic Resonator for Aquatic Animal Tracking" IEEE Transactions on Magnetics 55 (2), 2019, 1. Over the past three decades, passive acoustic telemetry has significantly helped marine scientist to study and understand the spatial ecology, migratory behaviors, and mortality rates of aquatic animals. A popular telemetry system consists of two components: an acoustic transmitter tag attached to an aquatic animal and powered by a small battery, and a stationary station that receives the acoustic signals from the tagged animal and determines its location

One-step Synthesis and Decoration of Nickel Oxide Nanosheets with Gold Nanoparticles by Reduction Method for Hydrazine Sensing Application

1 min read ·
Ahmed Rafiq, et al., "One-step Synthesis and Decoration of Nickel Oxide Nanosheets with Gold Nanoparticles by Reduction Method for Hydrazine Sensing Application". Sensors and Actuators B: Chemical, 286, 2019, 139. Morphology, nanoscale features, and tunable properties are the fundamentals of nanomaterials to many applications in use nowadays. Exciting approaches are utilized for developing and exploring new nanomaterials that enable broader impact on a variety of application areas. In this study, we synthesized thin nickel oxide (NiO) nanosheets using wet chemistry process and modified their

Wearable Electronics: An Imperceptible Magnetic Skin (Adv. Mater. Technol. 10/2019)

1 min read ·
Abdullah S. Almansouri, et al., "Wearable Electronics: An Imperceptible Magnetic Skin (Adv. Mater. Technol. 10/2019)." Advanced Materials Technologies 4 (10), 2019, 1970052. In article number 1900493 by Abdullah S. Almansouri, Jurgen Kosel, and co‐workers, a wearable magnetic skin provides remote operation and sensing solutions without the need for wires, on‐chip batteries, etc. Versatile in color and shape and extremely flexible, it can be imperceptible or eye‐catching and paves the way for numerous applications, such as tracking eye movements or contact‐free user‐machine interfaces.

A MXene‐Based Wearable Biosensor System for High‐Performance In Vitro Perspiration Analysis

1 min read ·
Yongjiu Lei, et al., "A MXene‐Based Wearable Biosensor System for High‐Performance In Vitro Perspiration Analysis". Small 15(19), 2019, 1901190. Wearable electrochemical biosensors for sweat analysis present a promising means for noninvasive biomarker monitoring. However, sweat‐based sensing still poses several challenges, including easy degradation of enzymes and biomaterials with repeated testing, limited detection range and sensitivity of enzyme‐based biosensors caused by oxygen deficiency in sweat, and poor shelf life of sensors using all‐in‐one working electrodes patterned by traditional

A Comparison of Artificial Neural Network (ANN) and Support Vector Machine (SVM) Classifiers for Neural Seizure Detection

1 min read ·
Elgammal, M, et al., "A Comparison of Artificial Neural Network (ANN) and Support Vector Machine (SVM) Classifiers for Neural Seizure Detection". IEEE 62nd International Midwest Symposium on Circuits and Systems (MWSCAS) 2019, 646. In this paper, two different classifiers are software and hardware implemented for neural seizure detection. The two techniques are support vector machine(SVM) and artificial neural networks(ANN). The two techniques are pretrained on software and only the classifiers are hardware implemented and tested. A comparison of the two techniques is performed on the levels

KAUST Research Conference 2019: New Trends in Biosensors and Bioelectronics

1 min read ·
The “KAUST Research Conference on New Trends in Biosensors and Bioelectronics” was held in KAUST between the 25th and 27th of February. This yearly event aims to give an overview of the most recent efforts in bioelectronics that tackle the “interface” problem and overcome the limits of the current technologies by generating new materials/architectures/device components. With its truly interdisciplinary nature, this conference will bring scientists from different disciplines together, including Chemistry, Electrical Engineering, Biology, and Material Science, who are at the top of their

Organic field effect transistors (OFETs) in environmental sensing and health monitoring: A review

1 min read ·
Sandeep G. Surya, et al., "Organic Field Effect Transistors (OFETs) in Environmental Sensing and Health Monitoring: A review, Trends in Analytical Chemistry 111, 2019, 27. Abstract: Organic field effect transistors (OFETs) have been the focus of sensing application research during the last two decades. In comparison to their inorganic counterparts, OFETs have multiple advantages such as low-cost manufacturing, large area coverage, flexibility, and readily tunable electronic material properties. To date, various organic semiconductors (OSCs), both polymers and small molecules, have been

A Chitosan Gold Nanoparticles Molecularly Imprinted Polymer Based Ciprofloxacin Sensor

1 min read ·
Sandeep G. Surya, et al., "A Chitosan Gold Nanoparticles Molecularly Imprinted Polymer Based Ciprofloxacin Sensor." RSC Advances 10 (22), 2020, 12823. In this work, we present a novel study on the development of an electrochemical biomimetic sensor to detect the ciprofloxacin (CIP) antibiotic. A chitosan gold nanoparticles decorated molecularly imprinted polymer (Ch-AuMIP) was used to modify the glassy carbon electrode (GCE) for preparation of the sensor. The Ch-AuMIP was characterized to understand various properties like chemical composition, morphology, roughness, and conduction using

A label-free Aptasensor FET Based on Au Nanoparticle Decorated Co3 O4 Nanorods and a SWCNT Layer for Detection of Cardiac Troponin T Protein

1 min read ·
Sandeep G. Surya, et al., "A label-free Aptasensor FET Based on Au Nanoparticle Decorated Co3 O4 Nanorods and a SWCNT Layer for Detection of Cardiac Troponin T Protein." Journal of Materials Chemistry B 8, 2020, 18. Acute myocardial infarction (AMI) is a serious health problem that must be identified in its early stages. Considerable progress has been made in understanding the condition of AMI through ascertaining the role of biomarkers, such as myoglobin, cardiac troponin proteins (T and I), creatine kinase-MB, and fatty acid-binding protein (FABP). A field-effect transistor (FET) is an

Fully Inkjet‐Printed, Ultrathin and Conformable Organic Photovoltaics as Power Source Based on Cross‐Linked PEDOT:PSS Electrodes

1 min read ·
Eloïse Bihar, et al., "Fully Inkjet‐Printed, Ultrathin and Conformable Organic Photovoltaics as Power Source Based on Cross‐Linked PEDOT:PSS Electrodes" Advance Material Technology 2000226 , 2020, 1. Ultra‐lightweight solar cells have attracted enormous attention due to their ultra‐conformability, flexibility, and compatibility with applications including electronic skin or miniaturized electronics for biological applications. With the latest advancements in printing technologies, printing ultrathin electronics is becoming now a reality. This work offers an easy path to fabricate indium tin

Meet KAUST prospective student: Carlos Augusto Zan Malaguti

1 min read ·
Carlos Augusto Zan Malaguti, 23, from Brazil, obtained his bachelor’s degree in electronics and telecommunications engineering from Sao Paulo State University (UNESP). Carlos will join KAUST in the fall of 2020 as an M.S./Ph.D. candidate in the KAUST Sensors Lab under the supervision of Professor Khaled Nabil Salama.

A Compact, Passive Frequency-Hopping Harmonic Sensor Based on a Microfluidic Reconfigurable Dual-Band Antenna

1 min read ·
Liang Zhu, et al., "A Compact, Passive Frequency-Hopping Harmonic Sensor Based on a Microfluidic Reconfigurable Dual-Band Antenna," IEEE Sensors Journal, 2020, 1. We propose here a fully-passive wireless liquid sensor using a harmonic transponder, which comprises a dual-band microstrip antenna reconfigured by different types of liquids injected in a fluidic cavity. Different from traditional radio-frequency (RF) backscatter sensors, the proposed harmonic-transponder sensor (or harmonic sensor) receives frequency-hopped RF monotones and backscatters their second harmonics, with the peak

Growth of large-scale MoS2 nanosheets on double layered ZnCo2O4 for real-time in-situ H2S monitoring in live cells

1 min read ·
Mani Veerappan et al., "Growth of large-scale MoS2 nanosheets on double layered ZnCo2O4 for real-time in-situ H2S monitoring in live cells"Journal of Materials Chemistry B, 2020, 1. There is an urgent need to develop in-situ sensors that monitor the continued release of H2S from biological systems to understand H2S-related pathology and pharmacology. For this purpose, we have developed a molybdenum disulfide supported double-layered zinc cobaltite modified carbon cloth electrode (MoS2–ZnCo2O4–ZnCo2O4) based electrocatalytic sensor. The results of our study suggest that the MoS2–ZnCo2O4–ZnCo2O4

Laser scribed graphene: A novel platform for highly sensitive detection of eletroactive biomolecules

1 min read ·
Abdelghani Ghanam, et al., "Laser scribed graphene: A novel platform for highly sensitive detection of eletroactive biomolecules" Biosensors and Bioelectronics, 2020, 112509. Laser-scribed graphene electrodes (LSGEs) have recently shown a potential for the development of electrochemical biosensors thanks to their electronic properties, porous structures, and large surface area that can support the charge transfer. In this paper, the authors present a comparative study of the electrochemical performances of LSGEs with the conventional screen-printed carbon electrodes (SPCEs) toward the

Coating of Conducting and Insulating Threads with Porous MOF Particles through Langmuir-Blodgett Technique

1 min read ·
Sakandar Rauf, et al., "Coating of Conducting and Insulating Threads with Porous MOF Particles through Langmuir-Blodgett Technique." Nanomaterials 11 (1), 2021, 160. The Langmuir-Blodgett (LB) method is a well-known deposition technique for the fabrication of ordered monolayer and multilayer thin films of nanomaterials onto different substrates that plays a critical role in the development of functional devices for various applications. This paper describes detailed studies about the best coating configuration for nanoparticles of a porous metal-organic framework (MOF) onto both insulating or

Plant probes make sense for sustainable farming

1 min read ·
Ultrathin needles for probing plants could help keep crop health in check.

Yuvaraj Sivalingam

Yuvaraj Sivalingam is a Research Scientist at the Sensors Lab, Computer, Electrical, and Mathematical Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia. Education and Early Career He received his M.Sc. in Physics in 2007 from Madurai Kamaraj University, India and in 2009 he received his M.Tech. in Sensor System Technology from VIT University (India), with a project entitled “Studies on the development of compositions for hydrogen sensing applications and their relevant instrumentation’. In 2008-2009 during his M.Tech.

Tutku Beduk

Tutku Beduk is currently a PhD student at the Sensors Lab, in the Material Science and Engineering Department, MSE, King Abdullah University of Science and Technology (KAUST). Education and Early Career Tutku Bedük received her bachelor degree from Middle East Technical University in Chemistry with a High Honor Degree, Turkey in 2016. She also competed her MSc degree in Bilkent University in the field of Chemistry, Turkey in 2018. She is currently a PhD candidate in the Sensor Lab Group under the direction of Prof. Khaled Nabil Salama at King Abdullah University of Science and Technology

Sandeep Surya

Postdoctoral Research Fellow, Sensors
Dr. Sandeep Surya is currently a Post-Doctoral fellow at the Sensors Lab, in the Electrical Engineering Department, CEMSE, King Abdullah University of Science and Technology (KAUST). Education and Early Career Dr. Sandeep G. Surya received his Ph.D. degree from IIT Bombay in 2017. He is currently a Post-Doctoral Fellow with Sensors Lab, CEMSE Division, King Abdullah University of Science and Technology. Prior to this, he was a Research Associate with the Microsystems Technology Research Unit, Fondazione Bruno Kessler, Trento, Italy. His forte is in building platforms for different sensor

Sanjit Majhi

Postdoctoral Research Fellow, Sensors
Sanjit Manohar Majhi has recently joined the Sensors group, as a Postdoctoral fellow. Dr. Majhi currently focused on the synthesis of nanomaterials based on 1D/2D metal oxides for gas and biosensing applications. Education and early career Sanjit Manohar Majhi received his Ph.D. degree from the department of Electronic Information Materials Engineering in Chonbuk National University, South Korea in August 2017. He received his master degree in Chemistry from Utkal University, Bhubaneswar in India in 2008. He joined recently in King Abdullah University of Science and Technology, to work under

Saptami Suresh Shetty

M.S. Student, Bioengineering
Saptami Suresh Shetty is a Biomedical Engineering MS/PhD student at Sensors Lab, King Abdullah University of Science and Technology (KAUST). Her areas of focus include Biosensors, Microfabrication and Biomaterials. Education and Early Career Saptami Suresh Shetty received her bachelor’s degree in Biomedical Engineering from the university Vellore Institute of Technology, India. Research Interests Saptami Suresh Shetty is interested in the development of biosensors for the detection of cancer, using a cancer biomarker, her interest also includes optimizing the biosensing platform and

Murilo Calil Faleiros

M.S. Student, Bioengineering
Murilo Calil Faleiros is a Medical Physicist, currently a Bioengineering Ms/PhD student at Sensors Lab, King Abdullah University of Science and Technology (KAUST). His areas of focus include Organic Electronics, Organic Transistors, Biosensors and Device developments. Education and Early Career Murilo Calil Faleiros received his bachelor’s degree in Medical Physics from University of São Paulo, Brazil. Research Interests Murilo Calil Faleiros is interested in the development of devices for biomedical applications and organic electronics, such as organic field effect transistors and others

Eloise Bihar

Postdoctoral Research Fellow, Sensors
Eloise is a postdoctoral fellow specialized in the field of Printed electronics for biomedical applications. Education and early career Eloise received her M.Sc. in engineering, from Grenoble INP-Pagora, in Grenoble, France, in 2010. She later received her PhD. in bioelectronics from Ecole des Mines de Saint Etienne in France in 2016 under the guidance of Prof. George Malliaras. She is currently working in Prof. Khaled Salama’s group, in collaboration with the groups of Prof. Inal and Prof. Baran. Research Interests Eloise’s current research focuses on the fabrication of printed autonomous

Daísy Camargo Ferreira

M.S. Student, Bioengineering
Daísy Camargo Ferreira is a Medical Physicist, currently a Bioengineering Ms/PhD student at Sensors Lab, King Abdullah University of Science and Technology (KAUST). Her areas of interests are Biosensors, Aptasensors and Point of Care Devices. Education and Early Career Daísy Camargo Ferreira received her bachelor’s degree in Medical Physics from University of São Paulo, Brazil. Research Interests Daísy Camargo Ferreira is interested in the development of biosensors for biomedical applications, such as cancer detection, including aptasensors and point of care devices development and

Carlos Augusto Zan Malaguti

Carlos Augusto Zan Malaguti is an M.S./Ph.D. candidate in the KAUST Sensors Lab under the supervision of Professor Khaled Nabil Salama. Education and Early Career Carlos received his bachelor’s degree in Electronics and Telecommunications Engineering from Sao Paulo State University (UNESP), Brazil, in 2020. During his undergrad, Carlos’ work focused on performance research through electrical characterization of 0.13 um SOI MOSFET devices. In the Summer/Fall of 2019, Carlos was a Visiting Student at KAUST, under the supervision of Professor Muhammad M. Hussain. He worked on nanofabrication

Abdullah Bukhamsin

Abdullah Bukhamsin is a Ph.D. student at the Sensors Lab, in the Bioengineering Department, under the supervision of Professor Khaled Nabil Salama at KAUST. Prior to this, Abdullah obtained an M.S. Degree in Engineering under the supervision of Professor Jurgen Kosel at King Abdullah University of Science and Technology (KAUST). Education and Early Career Abdullah Bukhamsin received his B.Sc. degree in Bioengineering from Rice University (Houston, Texas) in 2018. Following that, he completed his M.Sc. degree in Electrical Engineering from King Abdullah University of Science and Technology

Abdulrahman Aljedaibi

Electrical Engineering PhD student at CEMSE, King Abdullah University of Science and Technology (KAUST).
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Olga Krestinskaya

International recognition for KAUST Ph.D. candidate Olga Krestinskaya

3 min read ·
Olga Krestinskaya, a KAUST Ph.D. student, wins Best Poster at the 2024 Nature Neuromorphic Computing Conference for her work on energy-efficient AI hardware.

Implantable and Wearable Microelectronic Devices to Improve Quality of Life for People with Disabilities

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B3 L5 R5209

Implantable medical devices (IMD) and neuroprostheses are finding applications in new therapies thanks to advancements in microelectronics, sensors, RF communications, and medicine, which have resulted in embedding more functions in IMDs that occupy smaller spaces down to millimeters and consume less power, while offering therapies for more complex diseases and disabilities. I will address the latest developments in key building blocks for state-of-the-art IMDs.

Dr. Atif Shamim appointed Associate Editor for IEEE Transactions on Antennas & propagation

1 min read ·
Dr. Atif Shamim has been appointed Associate Editor for IEEE Transactions on Antennas & Propagation (TAP). He has been included in the editorial board due to his work on "Co-design of on-chip antennas and circuits on CMOS platform".

5.2-GHz RF Power Harvesting Module in 0.18 μm CMOS for Biomedical Implantable Sensors

1 min read ·
Mahmoud H. Ouda, et al., "5.2-GHz RF Power Harvesting Module in 0.18 μm CMOS for Biomedical Implantable Sensors" IEEE Transactions on Microwave Theory and Techniques 61, (5), 2013, 2177. Abstract: A first fully integrated 5.2-GHz CMOS-based RF power harvester with an on-chip antenna is presented in this paper. The design is optimized for sensors implanted inside the eye to wirelessly monitor the intraocular pressure of glaucoma patients. It includes a five-stage RF rectifier with an on-chip antenna, a dc voltage limiter, two voltage sensors, a low dropout voltage regulator, and MOSCAP based on

Prof. Khaled Salama appointed Associate Editor for IEEE Transactions on Circuits and Systems II: Express Briefs

1 min read ·
Prof. Khaled N. Salama was appointed Associated Editor for IEEE Transactions on circuits and systems-II: Express Briefs (TCAS II) for the period 2014-2015.

Prof. Khaled Salama's Work On Fractional Order Element Based Impedance Matching, Granted US Patent US 8762114

1 min read ·
Prof. Khaled Salama in collaboration with Dr. Ahmed Radwan and Prof. Atif Shamim obtained a US Patent

A novel design of antenna array developed by KAUST scientists

1 min read ·
At the sensors lab, Prof. K.N. Salama and Prof. A. Shamim led a team of KAUST founding masters students Farhan Abdul Ghaffar and Muhammad Umair Khalid to develop an aperture coupled patch antenna array SoP.

This is your light speaking, how can I help you?

1 min read ·
Prof. Salama's Smart Lighting System won the 1st prize at WEP Science Fair with a device that will change the way we interact with light.

New low cost diagnostic for cardiovascular risk detection

1 min read ·
A new flexible, low-cost cardiovascular risk marker biosensor was developed by Prof. Khaled Salama and his team at KAUST University, Saudi Arabia.

Miniature flexible sensor to detect heart disease

1 min read ·
A new biosensor made of laser-etched electrodes on a gold-coated polymer may provide an effective and cost-efficient way to assess heart disease risk.

Published paper: Single readout technique published at Nature Scientific Reports

1 min read ·
Prof. Khaled Salama and his team managed to achieve the theoretical limit of a single memory access per pixel for a gateless memristor array readout at a fraction of the power of state-of-the-art readout techniques.

Professor Khaled Salama awarded US patent on MEMS fractal capacitors

1 min read ·
Patent application US 20140239446 A1 on "Fractal Structures For Fixed MEMS Capacitors" was awarded a USA patent.

Three new patents for Professor Khaled Salama and the Sensors Lab Team

1 min read ·
With the latest project on Digital Chaos Systems, KAUST's Associate Professor of Electrical Engineering Khaled Salama and the Sensors-Lab's team (http://sensors.kaust.edu.sa/research/current/digital-chaos-systems) secured stunning achievements and three key patents, opening new frontiers for cybersecurity, cryptography, and electronic devices.

Prof. Salama's paper hits the top for 6 months in the row!

1 min read ·
In August 2016, Prof. Salama's article "Stochasticity Modeling in Memristors", was for the sixth time consecutively among the most downloaded paper of the month and the most read article in the IEEE Transactions on Nanotechnology (TNANO).

Flash Microfluidics, rapid Lab on a Chip fabrication method for cost- effective in situ production.

1 min read ·
From DNA sequencing to environment monitoring, microfluidics devices have been broadly employed, but their production is more and more time-consuming and expensive. Researchers from the King Abdullah University of Science and Technology (KAUST), Saudi Arabia, have developed an innovative prototyping method for Lab on a Chip (LOC) production to plummet costs while augmenting performances.

KAUST-born robotic avatar sets new era for undersea archaeology

1 min read ·
In 2015, an extensive archaeological programme led by the French Ministry of Culture and the University of Montpellier set up a scientific collaboration with Khaled Nabil Salama, Professor from CEMSE Division and co-worker Professor Christian R. Voolstra, from the KAUST Red Sea Research Center, in partnership with Stanford University and Meka Robotics, in California, to develop Ocean One, an agile avatar that affords immediate and haptic-visual interaction – the process of recognizing objects through touch - in the ocean environment at depths greater than 50m.

The raw power of human motion

1 min read ·
Standalone power modules that harvest and convert vibrations from their surroundings into electricity could soon fuel future microsystems.

Lining MOF pockets to detect noxious gases

1 min read ·
A porous material with tailor-made pockets stitched into its structure is a promising material for sensing noxious gases. A thin film of the material, coated onto an electrode, formed an electronic sensor that could detect traces of sulfur dioxide gas. The sensor is a significant step toward real-world devices that can sniff out dangerous gases in real air. Although several lab-based analytical instruments can detect traces of a specific gas in the air, these instruments are typically large, expensive, power-hungry machines. There is still a need for small, inexpensive, energy-efficient

Paper sensors remove the sting of diabetic testing

1 min read ·
Inkjet-printed device helps monitor a patient’s blood sugar levels without painful needles.

3D-printed cube dials into energy harvesting

1 min read ·
Ambient energy emitted by cellular phones and modems can be captured and converted into electricity using unusually shaped technology.

Tutku's first paper accepted at Sensors And Actuators B: chemical

1 min read ·
The present study describes the one-step synthesis of NiO nanosheets and successful surface modification of NiO nanosheets with Au NPs. This surface modification step is vital for an application (i.e., hydrazine sensing), where Au NPs enhance the surface area and provide synergistic effect during the electrocatalytic reaction. Better sensing performance, good reproducibility, cyclic stability, and selectivity confirms the reliable and promising application for hydrazine detection. The excellent electrocatalytic reaction for hydrazine demonstrates that these Au NPs modified NiO nanosheets can

MOFs can sense and sort troublesome gases

1 min read ·
Fluorinated metal-organic frameworks make excellent materials for selective sensing and removal of toxic gases.

Putting the sense in materials

1 min read ·
An interdisciplinary initiative is helping KAUST be at the forefront of a digital revolution, where sensors can find a use just about anywhere.

Single-electrode material streamlines functions into a tiny chip

1 min read ·
Ruthenium oxide is used to integrate energy-storing microsupercapacitors and thin-film electronics at the transistor level.

Sensing a heart attack before it strikes

1 min read ·
Nanomaterial-based electronic device monitors a key heart health biomarker.

Saudi researcher’s magnetic skin research garners widespread attention

1 min read ·
Imagine if there was a revolutionary wearable technology that could enable the user to open doors or operate machinery with a simple wave of their hand or a mere blink of their eye? What people might not realize is that this contact-free human-machine technology already exists—and it has been developed right here in a laboratory at KAUST.

Exciting New Technology Makes BPA Water Testing More Efficient

1 min read ·
In today’s world, it should come as no surprise that plastic dominates the products that we rely on each and every day. From our technology devices, to our water bottles, plastic is almost always an integral structural component.

Early warning sensor sniffs out cities' harmful gas

1 min read ·
An integrated detector device could form the basis of a distributed air-quality sensor network.

A Compact, Passive Frequency-Hopping Harmonic Sensor Based on a Microfluidic Reconfigurable Dual-Band Antenna

1 min read ·
Liang Zhu, et al., "A Compact, Passive Frequency-Hopping Harmonic Sensor Based on a Microfluidic Reconfigurable Dual-Band Antenna," IEEE Sensors Journal, 2020, 1. We propose here a fully-passive wireless liquid sensor using a harmonic transponder, which comprises a dual-band microstrip antenna reconfigured by different types of liquids injected in a fluidic cavity. Different from traditional radio-frequency (RF) backscatter sensors, the proposed harmonic-transponder sensor (or harmonic sensor) receives frequency-hopped RF monotones and backscatters their second harmonics, with the peak

Sensors get a laser shape up

1 min read ·
Laser writing breathes life into high-performance sensing platforms.

KAUST team power ahead with alternative energy research

1 min read ·
With the continued growth in Internet of Things applications, deployments, and devices, highly connected, sustainable smart cities are no longer mere concepts or fantastical future dreams; many are already active and are expanding apace.

Connect the internet of bodies

1 min read ·
A network of body monitoring devices connected using our own tissue could form the basis for the internet of bodies (IoB).

Perovskites used to make efficient artificial retina

1 min read ·
KAUST researchers have built an artificial electronic retina that mimics the behaviour of the eye’s rod retina cells. Their artificial retina can recognise handwritten numbers.
Montserrat Ramirez de Angel receiving the Best Pitch Award at IEEE 2024 Sensors Conference

Giving voice to the voiceless through assistive technology

2 min read ·
Artificial skin coupled with sensors and machine learning technology allows people with voice disorders to communicate using soundless mouth movements.

Tutku Beduk

Tutku Beduk is currently a PhD student at the Sensors Lab, in the Material Science and Engineering Department, MSE, King Abdullah University of Science and Technology (KAUST). Education and Early Career Tutku Bedük received her bachelor degree from Middle East Technical University in Chemistry with a High Honor Degree, Turkey in 2016. She also competed her MSc degree in Bilkent University in the field of Chemistry, Turkey in 2018. She is currently a PhD candidate in the Sensor Lab Group under the direction of Prof. Khaled Nabil Salama at King Abdullah University of Science and Technology

Sandeep Surya

Postdoctoral Research Fellow, Sensors
Dr. Sandeep Surya is currently a Post-Doctoral fellow at the Sensors Lab, in the Electrical Engineering Department, CEMSE, King Abdullah University of Science and Technology (KAUST). Education and Early Career Dr. Sandeep G. Surya received his Ph.D. degree from IIT Bombay in 2017. He is currently a Post-Doctoral Fellow with Sensors Lab, CEMSE Division, King Abdullah University of Science and Technology. Prior to this, he was a Research Associate with the Microsystems Technology Research Unit, Fondazione Bruno Kessler, Trento, Italy. His forte is in building platforms for different sensor

Khaled Salama

Professor Salama is a prominent leader in the development of intelligent sensors, biosensors and very large-scale integration (VLSI) architectures for bioimaging and instrumentation. He is one of the founders of the Electrical and Computer Engineering (ECE) Program at KAUST.

Evangelos Piliouras

Education and early career Evangelos received his integrated master's degree with excellency, from the department of Electrical Engineering and Computer Technology in Patras in 2018. He recently joined King Abdullah University of Science and Technology (KAUST) and he works under the supervision of Prof. Meriem Laleg in the field of estimation. Evangelos did a 3-month internship in Dialog Semiconductor as a software developer, having developed a software automation tool. Research Interests Evangelos' research interests are found in the area of biosensors, embedded system design, modeling and
<> Gas Sensors (24)

Disposable, paper-based, inkjet-printed humidity and H2S gas sensor for passive sensing applications

1 min read ·
Abdul Quddious, et al., " Disposable, paper-based, inkjet-printed humidity and H2S gas sensor for passive sensing applications" . Sensors, 16 (12), 2016, 2073. An inkjet-printed, fully passive sensor capable of either humidity or gas sensing is presented herein. The sensor is composed of an interdigitated electrode, a customized printable gas sensitive ink and a specialized dipole antenna for wireless sensing. The interdigitated electrode printed on a paper substrate provides the base conductivity that varies during the sensing process. Aided by the porous nature of the substrate, a change in

H2S Sensors: Fumarate‐Based fcu‐MOF Thin Film Grown on a Capacitive Interdigitated Electrode

1 min read ·
Omar Yassine, et al., " H2S Sensors: Fumarate‐Based fcu‐MOF Thin Film Grown on a Capacitive Interdigitated Electrode". Angewandte Chemie International Edition, 55 (51), 2016, 15879. Herein we report the fabrication of an advanced sensor for the detection of hydrogen sulfide (H2S) at room temperature, using thin films of rare‐earth metal (RE)‐based metal–organic framework (MOF) with underlying fcu topology. This unique MOF‐based sensor is made via the in situ growth of fumarate‐based fcu‐MOF (fum‐fcu‐MOF) thin film on a capacitive interdigitated electrode. The sensor showed a remarkable

MOFs for the sensitive detection of ammonia: Deployment of fcu-MOF thin films as effective chemical capacitive sensors

1 min read ·
Ayalew H. Assen, et al., " MOFs for the sensitive detection of ammonia: Deployment of fcu-MOF thin films as effective chemical capacitive sensors". ACS sensors, 2(9), 2017, 1294. This work reports on the fabrication and deployment of a select metal–organic framework (MOF) thin film as an advanced chemical capacitive sensor for the sensing/detection of ammonia (NH3) at room temperature. Namely, the MOF thin film sensing layer consists of a rare-earth (RE) MOF (RE-fcu-MOF) deposited on a capacitive interdigitated electrode (IDE). Purposely, the chemically stable naphthalene-based RE-fcu-MOF (NDC

Trianglamine-based supramolecular organic framework with permanent intrinsic porosity and tunable selectivity

1 min read ·
Arnaud Chaix, et al., "Trianglamine-based supramolecular organic framework with permanent intrinsic porosity and tunable selectivity", Journal of the American Chemical Society 140 (44), 2018, 14571. Here we introduce for the first time a metal-free trianglamine-based supramolecular organic framework, T-SOF-1, with permanent intrinsic porosity and high affinity to CO2. The capability of tuning the pore aperture dimensions is also demonstrated by molecular guest encapsulation to afford excellent CO2/CH4 separation for natural gas upgrading.

Highly sensitive and selective SO2 MOF sensor: the integration of MFM-300 MOF as a sensitive layer on a capacitive interdigitated electrode

1 min read ·
Valeriya Chernikova, et al., "Highly sensitive and selective SO2 MOF sensor: the integration of MFM-300 MOF as a sensitive layer on a capacitive interdigitated electrode." Journal of Materials Chemistry A 6(14), 2018, 5550. We report on the fabrication of an advanced chemical capacitive sensor for the detection of sulfur dioxide (SO2) at room temperature. The sensing layer based on an indium metal–organic framework (MOF), namely MFM-300, is coated solvothermally on a functionalized capacitive interdigitated electrode. The fabricated sensor exhibits significant detection sensitivity to SO2 at

The quest for highly sensitive QCM humidity sensors: The coating of CNT/MOF composite sensing films as case study

1 min read ·
Karumbaiah N. Chappanda, et al., "The quest for highly sensitive QCM humidity sensors: The coating of CNT/MOF composite sensing films as case study". Sensors and Actuators B: Chemical, 257, 2018, 609. The application of metal-organic frameworks (MOFs) as a sensing layer has been attracting great interest over the last decade, due to their uniform properties in terms of high porosity and tunability, which provides a large surface area and/or centers for trapping/binding a targeted analyte. Here we report the fabrication of a highly sensitive humidity sensor that is based on composite thin films

Concurrent Sensing of CO2 and H2O from Air Using Ultramicroporous Fluorinated Metal–Organic Frameworks: Effect of Transduction Mechanism on the Sensing Performance

1 min read ·
Mohamed Rachid Tchalala, et al., "Concurrent Sensing of CO2 and H2O from Air Using Ultramicroporous Fluorinated Metal–Organic Frameworks: Effect of Transduction Mechanism on the Sensing Performance." ACS Applied Materials & Interfaces 11 (1), 2019, 1706. Abstract: Conventional materials for gas/vapor sensing are limited to a single probe detection ability for specific analytes. However, materials capable of concurrent detection of two different probes in their respective harmful levels and using two types of sensing modes have yet to be explored. In particular, the concurrent detection of

Trianglamine Hydrochloride Crystals for a Highly Sensitive and Selective Humidity Sensor

1 min read ·
Karumbaiah N. Chappanda, et al., "Trianglamine Hydrochloride Crystals for a Highly Sensitive and Selective Humidity Sensor", Sensors and Actuators B: Chemical 294, 2019, 40. In this work, we present a highly sensitive and selective capacitive humidity sensor. Trianglamine hydrochloride is used as the sensing material, which is synthesized by a cyclocondensation reaction between terpthaldehyde and 1R,2R-cyclohexanediamine followed by addition of hydrochloric acid and vapor diffusion of acetone. The crystalline trianglamine hydrochloride salts are dispersed in acetonitrile and then coated

Fluorinated MOF Platform for Selective Removal and Sensing of SO 2 from Flue Gas and Air

1 min read ·
Mohamad Tchalala, et al., " Fluorinated MOF Platform for Selective Removal and Sensing of SO 2 from Flue Gas and Air", Nature communications, 10(1), 2019, 1. Conventional SO2 scrubbing agents, namely calcium oxide and zeolites, are often used to remove SO2 using a strong or irreversible adsorption-based process. However, adsorbents capable of sensing and selectively capturing this toxic molecule in a reversible manner, with in-depth understanding of structure–property relationships, have been rarely explored. Here we report the selective removal and sensing of SO2 using recently unveiled

Molybdenum trioxide (MoO3) Capacitive Soil Moisture Microsensor for In-situ Agriculture Applications: Measurement Studies and Temperature Effects

1 min read ·
Sandeep Surya, et al., " Molybdenum Trioxide (MoO3) Capacitive Soil Moisture Microsensor for In-situ Agriculture Applications: Measurement Studies and Temperature Effects". The soil moisture sensor is of utmost importance in agriculture due to issues including water conservation and disease prediction. This work presents the design and development of a molybdenum trioxide (MoO3) based capacitive soil moisture microsensor. The sensor comprises an inter-digitated electrode (IDE) on a silicon wafer and MoO3 is drop cast on IDE, which acts as the sensing film. IDE on Si wafer is mounted on the

Methanol and Humidity Capacitive Sensors Based on Thin Films of MOF Nanoparticles

1 min read ·
Miguel Andrés, et al., "Methanol and Humidity Capacitive Sensors Based on Thin Films of MOF Nanoparticles." ACS Applied Materials & Interfaces 12 (3) ,2020, 4155. The successful development of modern gas sensing technologies requires high sensitivity and selectivity coupled to cost effectiveness, which implies the necessity to miniaturize devices while reducing the amount of sensing material. The appealing alternative of integrating nanoparticles of a porous metal–organic framework (MOF) onto capacitive sensors based on interdigitated electrode (IDE) chips is presented. We report the

Organic field effect transistors (OFETs) in environmental sensing and health monitoring: A review

1 min read ·
Sandeep G. Surya, et al., "Organic Field Effect Transistors (OFETs) in Environmental Sensing and Health Monitoring: A review, Trends in Analytical Chemistry 111, 2019, 27. Abstract: Organic field effect transistors (OFETs) have been the focus of sensing application research during the last two decades. In comparison to their inorganic counterparts, OFETs have multiple advantages such as low-cost manufacturing, large area coverage, flexibility, and readily tunable electronic material properties. To date, various organic semiconductors (OSCs), both polymers and small molecules, have been

Fully Integrated Indium Gallium Zinc Oxide NO2 Gas Detector

1 min read ·
Mani Teja Vijjapu, et al.,"Fully Integrated Indium Gallium Zinc Oxide NO2 Gas Detector." ACS Sensors 5 (4), 2020, 984. We report an amorphous indium gallium zinc oxide (IGZO)-based toxic gas detection system. The microsystem contains an IGZO thin-film transistor (TFT) as a sensing element and exhibits remarkable selectivity and sensitivity to low concentrations of nitrogen dioxide (NO 2). In contrast to existing metal oxide-based gas sensors, which are active either at high temperature or with light activation, the developed IGZO TFT sensor is operable at room temperature and requires only

Realization of an Ultrasensitive and Highly Selective OFET NO2 Sensor: The Synergistic Combination of PDVT-10 Polymer and Porphyrin–MOF

1 min read ·
Saravanan Yuvaraja, et al., "Realization of an Ultrasensitive and Highly Selective OFET NO2 Sensor: The Synergistic Combination of PDVT-10 Polymer and Porphyrin–MOF." ACS Applied Materials & Interfaces 12 (16), 2020, 18748. Organic field-effect transistors (OFETs) are emerging as competitive candidates for gas sensing applications due to the ease of their fabrication process combined with the ability to readily fine-tune the properties of organic semiconductors. Nevertheless, some key challenges remain to be addressed, such as material degradation, low sensitivity, and poor selectivity toward

Fully Integrated Organic Field‐Effect Transistor Platform to Detect and to Quantify NO2 Gas

1 min read ·
Saravanan Yuvaraja, et al.,"Fully Integrated Organic Field‐Effect Transistor Platform to Detect and to Quantify NO2 Gas." physica status solidi (RRL)–Rapid Research Letters, 2020, 2000086. Herein, the gas sensing characteristics of PDVT‐10 organic field‐effect transistor (OFET) devices are explored and integrated to build a compact analog‐to‐digital converter (ADC) gas detection system. The electrical characteristics of the pristine PDVT‐10 OFET exhibit I on/I off ratio and threshold voltage as 104 and −12 V, respectively. Through the coating of a metal‐organic framework (MOF) on the surface

A Highly Selective Metal-Organic Framework Textile Humidity Sensor

1 min read ·
Sakandar Rauf, et al., "A Highly Selective Metal-Organic Framework Textile Humidity Sensor" ACS Applied Materials & Interfaces, 2020. The increase in demand and popularity of smart textiles brings new and innovative ideas to develop a diverse range of textile-based devices for our daily life applications. Smart textile-based sensors (TEX sensors) become attractive due to the potential to replace current solid-state sensor devices with flexible and wearable devices. We have developed a smart textile sensor for humidity detection using a metal-organic framework (MOF) as an active thin-film layer

An in-field integrated capacitive sensor for rapid detection and quantification of soil moisture

1 min read ·
Sandeep Surya, et al., "An in-field integrated capacitive sensor for rapid detection and quantification of soil moisture" Sensors and Actuators B: Chemical 2020, 128542. The development of in-situ soil moisture sensors (SMS) with advanced materials is the requirement of the future autonomous agriculture industry. However, an open challenge for these sensors is to control changes in the capacitance rather than resistance while attaining reliability, high performance, scalability and stability. In this work, a series of materials such as Graphite oxide (GO), Molybdenum disulfide (MoS2), Vanadium

Semitransparent graphite films growth on Ni and their double-sided polymer-free transfer

1 min read ·
G. Deokar, et al.,“Semitransparent graphite films growth on Ni and their double-sided polymer-free transfer”, accepted, Nature Scientific reports, 2020 Nanorange thickness graphite films (NGFs) are robust nanomaterials that can be produced via catalytic chemical vapour deposition but questions remain regarding their facile transfer and how surface topography may affect their application in next-generation devices. Here, we report the growth of NGFs (with an area of 55 cm 2 and thickness of ~ 100 nm) on both sides of a polycrystalline Ni foil and their polymer-free transfer (front- and back

A multi-bit fully integrated thin-film transistor NO2 gas detector at room temperature

1 min read ·
Mani Teja, et al., “A multi-bit fully integrated thin-film transistor NO2 gas detector at room temperature”, IEEE sensor letters 4 (8), 2020, 5501204. Inexpensive and compact gas sensing systems are indispensable for accurate air quality monitoring with broad spatial coverage. We report an InGaZnO thin-film transistor (TFT)-based integrated NO 2 gas detection system that yields a digital output proportional to the NO 2 concentration. This is the first report on integrated TFT-based detectors where gas concentration is quantified and where simultaneous digital output is provided without

Anti-poisoning electrode for real-time in-situ monitoring of hydrogen sulfide release

1 min read ·
Nithiya Jeromiyas, et al., " Anti-poisoning electrode for real-time in-situ monitoring of hydrogen sulfide release" Sensor and Actuators B: Chemistry 7 (10), 2020, 128844. Electrode poisoning and interferences from complex biological environments are major challenges in the development of in-situ H 2S sensors. To circumvent these issues, herein a robust electrode based on reduced graphene oxide-molybdenum disulfide nanohybrid (RGO-MoS 2) and polymerized o-phenylenediamine (POPD) is developed. The POPD/RGO-MoS 2-modified electrode catalyzed H 2S oxidation at a minimized overpotential (+ 0.15 V

A highly selective electron affinity facilitated H2S sensor: the marriage of tris(keto-hydrazone) and organic field-effect transistor

1 min read ·
Saravanan, Yuvaraja, et al. "A highly selective electron affinity facilitated H2S sensor: the marriage of tris (keto-hydrazone) and organic field-effect transistor." Materials Horizons, 2020. Conjugated polymers (CPs) are emerging as part of a promising future for gas-sensing applications. However, some of their limitations, such as poor specificity, humidity sensitivity and poor ambient stability, remain persistent. Herein, a novel combination of polymer-monomer heterostructure, derived from CP (PDVT-10) and a newly accomplished monomer has been integrated in an organic

Sandeep Surya

Postdoctoral Research Fellow, Sensors
Dr. Sandeep Surya is currently a Post-Doctoral fellow at the Sensors Lab, in the Electrical Engineering Department, CEMSE, King Abdullah University of Science and Technology (KAUST). Education and Early Career Dr. Sandeep G. Surya received his Ph.D. degree from IIT Bombay in 2017. He is currently a Post-Doctoral Fellow with Sensors Lab, CEMSE Division, King Abdullah University of Science and Technology. Prior to this, he was a Research Associate with the Microsystems Technology Research Unit, Fondazione Bruno Kessler, Trento, Italy. His forte is in building platforms for different sensor

Sanjit Majhi

Postdoctoral Research Fellow, Sensors
Sanjit Manohar Majhi has recently joined the Sensors group, as a Postdoctoral fellow. Dr. Majhi currently focused on the synthesis of nanomaterials based on 1D/2D metal oxides for gas and biosensing applications. Education and early career Sanjit Manohar Majhi received his Ph.D. degree from the department of Electronic Information Materials Engineering in Chonbuk National University, South Korea in August 2017. He received his master degree in Chemistry from Utkal University, Bhubaneswar in India in 2008. He joined recently in King Abdullah University of Science and Technology, to work under

Mani Teja Vijjapu

Mani Teja did his bachelors in Electronics and communications from Jawaharlal Technological University Anantapur, India in the year 2013. He worked as a research associate for Physical Research Laboratory, India for couple of years. He further continued to work as a research associate at IIT Madras, India. Later he pursued his masters in Solid state electronic devices from National Chiao-Tung University (NCTU), Taiwan and graduated in 2018. His Master’s thesis is focused on fabricating a binary synapse like memristor using atomic layer deposition. He did his summer internship at National
<> electrical engineering (17)

Perfect absorption graphene style

1 min read ·
A tiny device broadens the bandwith to enable absorption with wide-reaching potential for electrical engineering.

Miniature flexible sensor to detect heart disease

1 min read ·
A new biosensor made of laser-etched electrodes on a gold-coated polymer may provide an effective and cost-efficient way to assess heart disease risk.

Sneaky losses solved for resistive memory

1 min read ·
A data readout scheme achieves an unprecedented reduction in power consumption for a promising high-performance resistive memory architecture.

Bringing signals into phase

1 min read ·
A novel type of electronic component made from a blend of polymer materials could enable more effective circuitry.

3D-printed cube dials into energy harvesting

1 min read ·
Ambient energy emitted by cellular phones and modems can be captured and converted into electricity using unusually shaped technology.

MOFs can sense and sort troublesome gases

1 min read ·
Fluorinated metal-organic frameworks make excellent materials for selective sensing and removal of toxic gases.

Sensing a heart attack before it strikes

1 min read ·
Nanomaterial-based electronic device monitors a key heart health biomarker.

Early warning sensor sniffs out cities' harmful gas

1 min read ·
An integrated detector device could form the basis of a distributed air-quality sensor network.

Meet KAUST prospective student: Adilya Bakambekova

1 min read ·
She loves watching films not for the plot, but in order to rethink her beliefs. She is 22, she graduates from the School of Engineering in the capital. Adilya Bakambekova may seem ordinary: she loves walking in the park, powerlifting, taking care of her five-year-old wiener dog.

Sensors get a laser shape up

1 min read ·
Laser writing breathes life into high-performance sensing platforms.

Broadening horizons for people with quadriplegia

1 min read ·
An assistive technology uses magnetic skin to support freedom of movement for people with quadriplegia.

Brain-on-a-chip would need little training

1 min read ·
A neural network that mimics the biology of the brain can be loaded onto a microchip for faster and more efficient artificial intelligence.

KAUST team power ahead with alternative energy research

1 min read ·
With the continued growth in Internet of Things applications, deployments, and devices, highly connected, sustainable smart cities are no longer mere concepts or fantastical future dreams; many are already active and are expanding apace.

Plant probes make sense for sustainable farming

1 min read ·
Ultrathin needles for probing plants could help keep crop health in check.

Connect the internet of bodies

1 min read ·
A network of body monitoring devices connected using our own tissue could form the basis for the internet of bodies (IoB).

Perovskites used to make efficient artificial retina

1 min read ·
KAUST researchers have built an artificial electronic retina that mimics the behaviour of the eye’s rod retina cells. Their artificial retina can recognise handwritten numbers.

Aminta Naidili Castillo Robles

<> machine learning (17)

David Gomez-Cabrero

Associate Professor, Bioscience
Professor Cabrero's research focuses on developing statistics and machine learning tools for understanding biological systems that address health-related applications, advance biomedical research and enhance our understanding of the molecular mechanisms of diseases with the potential to uncover novel therapeutic approaches.

Hayssam Dahrouj

Senior Research Scientist at KAUST (King Abdullah University of Science and Technology)

Karen Sanchez

Postdoctoral Research Fellow
Karen Sanchez is a Postdoctoral Researcher in the IVUL lab at KAUST, specializing in deep learning, machine learning, and artificial intelligence (AI) for healthcare applications. Her research focuses on video understanding, domain adaptation, generative AI, and methods for preserving patient privacy.

Hani A. Al Majed

M.S. Student
Electrical and Computer Engineering Master's student at KAUST under the supervision of Professor Bernard Ghanem, with expertise in machine learning workflow automation, physics-informed neural operators, and AI for Science, particularly in chemistry applications. Passionate about leveraging AI to solve complex scientific problems.

Ahmad Sait

M.S. Student, Computer Science
Ahmad Sait is a Master's student in the Computer Science program at KAUST. Before joining KAUST, Ahmad obtained his Bachelor's degree in Computer Science from King Abdulaziz University, Saudi Arabia. Ahmad is also a KAUST Academy graduate from the AI track, having been under the supervision of Prof. Naeemullah Khan. The Academy provided him with seven opportunities to assist in teaching students enrolled in subsequent cohorts.

Saleh AlJazzar

Research Fellow at King Abdullah University of Science and Technology (KAUST) .

Muhammad Esmat

Visiting student at, King Abdullah University of Science and Technology (KAUST).

Yasser Jaber

Visiting Student Researcher ,Machine Learning Engineer at KAUST (King Abdullah University of Science and Technology).
Syed Abidullah Fareed

Syed Abidullah Fareed

Visiting Student (former), Information Science Lab

Ahsan Mehmood

Intern (former), Information Science Lab
Visiting student at King Abdullah University of Science and Technology (KAUST).

Abdulkarem Badiea Alshaibani

Visiting Student at the Information Science Lab at the King Abdullah University of Science and Technology (KAUST).

Embedded and Cyber Connected Systems (ECCS) Workshop

Prof. Ahmed Eltawil, Prof. Charalambos Konstantinou, Prof. Khaled Nabil Salama

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B2 L5 R5220

The workshop aims to bring together experts to present their latest research efforts related to Embedded and Cyber Connected Systems architectures and platforms that can scale efficiently, as well as operate securely and resiliently to provide the necessary resources demanded by current and future network applications.

Putting the sense in materials

1 min read ·
An interdisciplinary initiative is helping KAUST be at the forefront of a digital revolution, where sensors can find a use just about anywhere.

Broadening horizons for people with quadriplegia

1 min read ·
An assistive technology uses magnetic skin to support freedom of movement for people with quadriplegia.

Brain-on-a-chip would need little training

1 min read ·
A neural network that mimics the biology of the brain can be loaded onto a microchip for faster and more efficient artificial intelligence.
Montserrat Ramirez de Angel receiving the Best Pitch Award at IEEE 2024 Sensors Conference

Giving voice to the voiceless through assistive technology

2 min read ·
Artificial skin coupled with sensors and machine learning technology allows people with voice disorders to communicate using soundless mouth movements.

Abdulrahman Aljedaibi

Electrical Engineering PhD student at CEMSE, King Abdullah University of Science and Technology (KAUST).
<> memristor (14)

Time domain oscillating poles: stability redefined in memristor based Wien-oscillators

1 min read ·
Abdul Hafiz Talukdar, et al., "Time domain oscillating poles: stability redefined in memristor based Wien-oscillators." In 2010 International Conference on Microelectronics, 2010, 288. Traditionally, the necessary and sufficient condition for any system to be oscillating is that its poles are located on the imaginary (jω) axis. In this paper, for the first time, we have shown that systems can oscillate with time-domain oscillating poles. The idea is verified using a Memristor based Wien oscillator. Sustained oscillations are observed without having the poles of the system fixed on the

Generalized model for memristor-based Wien family oscillators

1 min read ·
Abdul Hafiz Talukdar, et al., "Generalized model for memristor-based Wien family oscillators." Microelectronics Journal 42 (9), 2011, 1032. In this paper, we report the unconventional characteristics of Memristor in Wien oscillators. Generalized mathematical models are developed to analyze four members of the Wien family using Memristors. Sustained oscillation is reported for all types though oscillating resistance and time dependent poles are present. We have also proposed an analytical model to estimate the desired amplitude of oscillation before the oscillation starts. These Memristor-based

Memristor-based reactance-less oscillator

1 min read ·
Mohamed Zidan, et al., "Memristor-based reactance-less oscillator." Electronics letters 47, (22) 2011, 1220. The first reactance-less oscillator is introduced. By using a memristor, the oscillator can be fully implemented on-chip without the need for any capacitors or inductors, which results in an area-efficient fully integrated solution. The concept of operation of the proposed oscillator is explained and detailed mathematical analysis is introduced. Closed-form expressions for the oscillation frequency and oscillation conditions are derived. Finally, the derived equations are verified with

Memristor-based relaxation oscillators using digital gates

1 min read ·
Moustafa A. Khatib, et al., "Memristor-based relaxation oscillators using digital gates." In 2012 Seventh International Conference on Computer Engineering & Systems (ICCES), 2012, 98. This paper presents two memristor-based relaxation oscillators. The proposed oscillators are designed without the need of any reactive elements, i.e., capacitor or inductor. As the "resistance storage" property of the memristor can be exploited to generate the oscillation. The proposed oscillators have the advantage that they can be fully integrated on-chip giving an area-efficient solution. Furthermore, these

Memristor-based mono-stable oscillator

1 min read ·
Bahgat, A. T., et al., "Memristor-based mono-stable oscillator." arXiv preprint , (2012). In this letter, a reactance-less mono-stable oscillator is introduced for the first time using memristors. By replacing bulky inductors and capacitors with memristors, the novel mono-stable oscillator can be an area-efficient solution for on-chip fully integrated systems. The proposed circuit is described, mathematically analysed and verified by circuit simulations.

Memristor: the illusive device

1 min read ·
Salama, Khaled Nabil. et al., "Memristor: the illusive device." In Proceedings of the great lakes symposium on VLSI, 2012, 208. The memristor (M) is considered to be the fourth two-terminal passive element in electronics, alongside the resistor (R), the capacitor (C), and the inductor (L). Its existence was postulated in 1971 but its first implementation was reported in 2008. Where was it hiding all that time and what can we do with it? Come and learn how the memristor completes the roster of electronic devices much like a missing particle that physicists seek to complete their tableaus.

Non linear dynamics of memristor based 3rd order oscillatory system

1 min read ·
Arka Talukdar, et al., "Non linear dynamics of memristor based 3rd order oscillatory system." Microelectronics journal 43 (3), 2012, 169. In this paper, we report for the first time the nonlinear dynamics of three memristor based phase shift oscillators, and consider them as a plausible solution for the realization of parametric oscillation as an autonomous linear time variant system. Sustained oscillation is reported through oscillating resistance while time dependent poles are present. The memristor based phase shift oscillator is explored further by varying the parameters so as to present

Improved Memristor-Based Relaxation Oscillator

1 min read ·
Ahmed G. Musad, et al., "Improved Memristor-Based Relaxation Oscillator" Microelectronics Journal Volume 44, (9), 2013, 814. Abstract: This paper presents an improved memristor-based relaxation oscillator which offers higher frequency and wider tunning range than the existing reactance-less oscillators. It also has the capability of operating on two positive supplies or alternatively a positive and negative supply. Furthermore, it has the advantage that it can be fully integrated on-chip providing an area-efficient solution. On the other hand, The oscillation concept is discussed then a

Memristor-based memory The sneak paths problem and solutions

1 min read ·
Mohammed A. Zidan, et al., "Memristor-based memory The sneak paths problem and solutions" Microelectronics Journal 44, (2), 2013, 176. Abstract: In this paper, we investigate the read operation of memristor-based memories. We analyze the sneak paths problem and provide a noise margin metric to compare the various solutions proposed in the literature. We also analyze the power consumption associated with these solutions. Moreover, we study the effect of the aspect ratio of the memory array on the sneak paths. Finally, we introduce a new technique for solving the sneak paths problem by gating

Mohammed Zidan awarded IEEE Circuits and Systems Society Pre-Doctoral Fellowship

1 min read ·
Mohammed Affan Zidan, sensors lab member and Ph.D. candidate in the Electrical Engineering (EE) Program at the Computer, Electrical, and Mathematical Science and Engineering (CEMSE) Division, received the IEEE Circuits and Systems (CAS) Society Pre-Doctoral Fellowship.

Statistical Analysis for Memristor Crossbar Memories

1 min read ·
Rawan Naous, et al., "Statistical Analysis for Memristor Crossbar Memories." Int. Journal of Unconventional Computing 12, 2016, 251. The inherent memory capabilities bound with compactness and scalability features pose the memristor as an ideal rival for conventional nonvolatile memories. Its use within a crossbar structure offers high-density storage and tight dimensionality. A fitting parameter in the midst of the trend towards nanoscale integration, where gateless memories are on the rise in an attempt to achieve further space savings. Nonetheless, the gate sacrifice comes at the expense of

Memristor-based neural networks: Synaptic versus neuronal stochasticity

1 min read ·
Rawan Naous, et al., "Memristor-based neural networks: Synaptic versus neuronal stochasticity." Aip Advances 6, (11), 2016, 111304. In neuromorphic circuits, stochasticity in the cortex can be mapped into the synaptic or neuronal components. The hardware emulation of these stochastic neural networks are currently being extensively studied using resistive memories or memristors. The ionic process involved in the underlying switching behavior of the memristive elements is considered as the main source of stochasticity of its operation. Building on its inherent variability, the memristor is

Single-readout high-density memristor crossbar

1 min read ·
Mohammed A. Zidan, et al., "Single-readout high-density memristor crossbar." Scientific reports 6, 2016, 18863. High-density memristor-crossbar architecture is a very promising technology for future computing systems. The simplicity of the gateless-crossbar structure is both its principal advantage and the source of undesired sneak-paths of current. This parasitic current could consume an enormous amount of energy and ruin the readout process. We introduce new adaptive-threshold readout techniques that utilize the locality and hierarchy properties of the computer-memory system to address the

Mohammed Affan Zidan

Mohammed Affan Zidan obtained his Ph.D. Degree in the Electrical Engineering (EE) Program from King Abdullah University of Science and Technology, under the supervision of Prof. Khaled Nabil Salama. Mohammed Zidan earned his M.Sc. in Electronics and Communications Engineering from Faculty of Engineering, Cairo University, Egypt in 2010, where he was ranked first. In 2006, he received his B.Sc. in Electronics and Communications Engineering, Institute of Aviation Engineering and Technology (IAET), Egypt, also ranking first. Before joining KAUST, he worked as a teaching assistant at the German
<> antenna arrays (11)

Prof. Khaled Salama appointed Associate Editor for IEEE Transactions on Circuits and Systems II: Express Briefs

1 min read ·
Prof. Khaled N. Salama was appointed Associated Editor for IEEE Transactions on circuits and systems-II: Express Briefs (TCAS II) for the period 2014-2015.

Prof. Khaled Salama's Work On Fractional Order Element Based Impedance Matching, Granted US Patent US 8762114

1 min read ·
Prof. Khaled Salama in collaboration with Dr. Ahmed Radwan and Prof. Atif Shamim obtained a US Patent

A novel design of antenna array developed by KAUST scientists

1 min read ·
At the sensors lab, Prof. K.N. Salama and Prof. A. Shamim led a team of KAUST founding masters students Farhan Abdul Ghaffar and Muhammad Umair Khalid to develop an aperture coupled patch antenna array SoP.

This is your light speaking, how can I help you?

1 min read ·
Prof. Salama's Smart Lighting System won the 1st prize at WEP Science Fair with a device that will change the way we interact with light.

New low cost diagnostic for cardiovascular risk detection

1 min read ·
A new flexible, low-cost cardiovascular risk marker biosensor was developed by Prof. Khaled Salama and his team at KAUST University, Saudi Arabia.

Professor Khaled Salama awarded US patent on MEMS fractal capacitors

1 min read ·
Patent application US 20140239446 A1 on "Fractal Structures For Fixed MEMS Capacitors" was awarded a USA patent.

Three new patents for Professor Khaled Salama and the Sensors Lab Team

1 min read ·
With the latest project on Digital Chaos Systems, KAUST's Associate Professor of Electrical Engineering Khaled Salama and the Sensors-Lab's team (http://sensors.kaust.edu.sa/research/current/digital-chaos-systems) secured stunning achievements and three key patents, opening new frontiers for cybersecurity, cryptography, and electronic devices.

Prof. Salama's paper hits the top for 6 months in the row!

1 min read ·
In August 2016, Prof. Salama's article "Stochasticity Modeling in Memristors", was for the sixth time consecutively among the most downloaded paper of the month and the most read article in the IEEE Transactions on Nanotechnology (TNANO).

Flash Microfluidics, rapid Lab on a Chip fabrication method for cost- effective in situ production.

1 min read ·
From DNA sequencing to environment monitoring, microfluidics devices have been broadly employed, but their production is more and more time-consuming and expensive. Researchers from the King Abdullah University of Science and Technology (KAUST), Saudi Arabia, have developed an innovative prototyping method for Lab on a Chip (LOC) production to plummet costs while augmenting performances.

KAUST-born robotic avatar sets new era for undersea archaeology

1 min read ·
In 2015, an extensive archaeological programme led by the French Ministry of Culture and the University of Montpellier set up a scientific collaboration with Khaled Nabil Salama, Professor from CEMSE Division and co-worker Professor Christian R. Voolstra, from the KAUST Red Sea Research Center, in partnership with Stanford University and Meka Robotics, in California, to develop Ocean One, an agile avatar that affords immediate and haptic-visual interaction – the process of recognizing objects through touch - in the ocean environment at depths greater than 50m.

Khaled Salama

Professor Salama is a prominent leader in the development of intelligent sensors, biosensors and very large-scale integration (VLSI) architectures for bioimaging and instrumentation. He is one of the founders of the Electrical and Computer Engineering (ECE) Program at KAUST.
<> artificial intelligence (11)
Najmeddine Dhieb

Najmeddine Dhieb

Yasmeen Alsaedy

M.S. Student, Computer Science
She is an AI researcher specializing in generative AI and deep learning. With a strong academic foundation and hands-on experience in machine learning, data science and artificial intelligence, she is passionate about advancing AI applications in real-world scenarios. She has contributed to cutting-edge projects, published research, and collaborated on innovative solutions that bridge the gap between AI theory and practice. Her expertise includes designing and implementing advanced data models, AI-driven visual/text computing, and deep learning architectures.

Yasser Jaber

Visiting Student Researcher ,Machine Learning Engineer at KAUST (King Abdullah University of Science and Technology).
Syed Abidullah Fareed

Syed Abidullah Fareed

Visiting Student (former), Information Science Lab

Ahmed Youssef Ragab Radwan

Visiting Student (former), Information Science Lab
Visiting student at the Information Science Lab, in the Electrical Engineering Department, CEMSE, King Abdullah University of Science and Technology (KAUST)

Broadening horizons for people with quadriplegia

1 min read ·
An assistive technology uses magnetic skin to support freedom of movement for people with quadriplegia.

Brain-on-a-chip would need little training

1 min read ·
A neural network that mimics the biology of the brain can be loaded onto a microchip for faster and more efficient artificial intelligence.

Perovskites used to make efficient artificial retina

1 min read ·
KAUST researchers have built an artificial electronic retina that mimics the behaviour of the eye’s rod retina cells. Their artificial retina can recognise handwritten numbers.
Montserrat Ramirez de Angel receiving the Best Pitch Award at IEEE 2024 Sensors Conference

Giving voice to the voiceless through assistive technology

2 min read ·
Artificial skin coupled with sensors and machine learning technology allows people with voice disorders to communicate using soundless mouth movements.

Fellipe Augusto Araújo Leandro

Fellipe received his bachelor degree in Electrical Engineering from Federal University of Rio Grande do Norte (UFRN), Brazil, in 2019. During his undergraduation, he worked in researches related to microcontroller-based embedded systems platforms, with focus in embedded software programming and PCB design. In 2019, he worked as an intern in a startup company developing embedded software for a Lora-based biotelemetry system, and also in another startup developing PCB design for low-cost Educational robotics and electronics. In 2020, he joined KAUST to research under the supervision of Professor

Abdurauf Abdurakhmanov

<> IoT (10)
Montserrat Ramirez de Angel receiving the Best Pitch Award at IEEE 2024 Sensors Conference

A voice to the voiceless: Montserrat Ramirez De Angel takes “Best Pitch” award at IEEE 2024 Sensors Conference

3 min read ·
Montserrat Ramirez de Angel wins the Best Pitch Award at IEEE 2024 Sensors Conference for her innovative work in biosensors and sensor technology.
Syed Abidullah Fareed

Syed Abidullah Fareed

Visiting Student (former), Information Science Lab

Ahsan Mehmood

Intern (former), Information Science Lab
Visiting student at King Abdullah University of Science and Technology (KAUST).

Flash Microfluidics, rapid Lab on a Chip fabrication method for cost- effective in situ production.

1 min read ·
From DNA sequencing to environment monitoring, microfluidics devices have been broadly employed, but their production is more and more time-consuming and expensive. Researchers from the King Abdullah University of Science and Technology (KAUST), Saudi Arabia, have developed an innovative prototyping method for Lab on a Chip (LOC) production to plummet costs while augmenting performances.

3D-printed cube dials into energy harvesting

1 min read ·
Ambient energy emitted by cellular phones and modems can be captured and converted into electricity using unusually shaped technology.

Single-electrode material streamlines functions into a tiny chip

1 min read ·
Ruthenium oxide is used to integrate energy-storing microsupercapacitors and thin-film electronics at the transistor level.

Toward Self-Powered Internet of Underwater Things Devices

1 min read ·
Jose de Oliveira, et al., "Toward Self-Powered Internet of Underwater Things Devices." IEEE Communications Magazine 58 (1), 2020, 68. Exploiting light beams to carry information and deliver power is suggested as a potential technology to recharge batteries in future generations of IoT and IoUT devices while providing optical connectivity. SLIPT has been recently proposed as an efficient method of wireless power transfer between communicating terminals. In this article, we provide an overview of the various SLIPT techniques in the time, power, and space domains. We also demonstrate two SLIPT

The power of light for internet of underwater things

1 min read ·
Light can simultaneously transfer energy and data to underwater devices, but there’s a long way to go before these systems can be deployed.

KAUST team power ahead with alternative energy research

1 min read ·
With the continued growth in Internet of Things applications, deployments, and devices, highly connected, sustainable smart cities are no longer mere concepts or fantastical future dreams; many are already active and are expanding apace.

Connect the internet of bodies

1 min read ·
A network of body monitoring devices connected using our own tissue could form the basis for the internet of bodies (IoB).
<> lab-on-a-chip (10)

Prof. Khaled Salama appointed Associate Editor for IEEE Transactions on Circuits and Systems II: Express Briefs

1 min read ·
Prof. Khaled N. Salama was appointed Associated Editor for IEEE Transactions on circuits and systems-II: Express Briefs (TCAS II) for the period 2014-2015.

Prof. Khaled Salama's Work On Fractional Order Element Based Impedance Matching, Granted US Patent US 8762114

1 min read ·
Prof. Khaled Salama in collaboration with Dr. Ahmed Radwan and Prof. Atif Shamim obtained a US Patent

A novel design of antenna array developed by KAUST scientists

1 min read ·
At the sensors lab, Prof. K.N. Salama and Prof. A. Shamim led a team of KAUST founding masters students Farhan Abdul Ghaffar and Muhammad Umair Khalid to develop an aperture coupled patch antenna array SoP.

This is your light speaking, how can I help you?

1 min read ·
Prof. Salama's Smart Lighting System won the 1st prize at WEP Science Fair with a device that will change the way we interact with light.

New low cost diagnostic for cardiovascular risk detection

1 min read ·
A new flexible, low-cost cardiovascular risk marker biosensor was developed by Prof. Khaled Salama and his team at KAUST University, Saudi Arabia.

Published paper: Single readout technique published at Nature Scientific Reports

1 min read ·
Prof. Khaled Salama and his team managed to achieve the theoretical limit of a single memory access per pixel for a gateless memristor array readout at a fraction of the power of state-of-the-art readout techniques.

Professor Khaled Salama awarded US patent on MEMS fractal capacitors

1 min read ·
Patent application US 20140239446 A1 on "Fractal Structures For Fixed MEMS Capacitors" was awarded a USA patent.

Three new patents for Professor Khaled Salama and the Sensors Lab Team

1 min read ·
With the latest project on Digital Chaos Systems, KAUST's Associate Professor of Electrical Engineering Khaled Salama and the Sensors-Lab's team (http://sensors.kaust.edu.sa/research/current/digital-chaos-systems) secured stunning achievements and three key patents, opening new frontiers for cybersecurity, cryptography, and electronic devices.

Flash Microfluidics, rapid Lab on a Chip fabrication method for cost- effective in situ production.

1 min read ·
From DNA sequencing to environment monitoring, microfluidics devices have been broadly employed, but their production is more and more time-consuming and expensive. Researchers from the King Abdullah University of Science and Technology (KAUST), Saudi Arabia, have developed an innovative prototyping method for Lab on a Chip (LOC) production to plummet costs while augmenting performances.

Khaled Salama

Professor Salama is a prominent leader in the development of intelligent sensors, biosensors and very large-scale integration (VLSI) architectures for bioimaging and instrumentation. He is one of the founders of the Electrical and Computer Engineering (ECE) Program at KAUST.
<> Computer Vision (9)

Abdelrahman Eldesokey

Postdoctoral Research Fellow
I am a Postdoctoral Fellow at KAUST, Saudi Arabia, specializing in Generative AI and conducting research on advanced topics in Generative and Large Language Models (LLMs). I bring over 11 years of combined academic and industrial experience in Computer Vision and Deep Learning across Sweden, Egypt, and Saudi Arabia.
Najmeddine Dhieb

Najmeddine Dhieb

Karen Sanchez

Postdoctoral Research Fellow
Karen Sanchez is a Postdoctoral Researcher in the IVUL lab at KAUST, specializing in deep learning, machine learning, and artificial intelligence (AI) for healthcare applications. Her research focuses on video understanding, domain adaptation, generative AI, and methods for preserving patient privacy.

Aznaur Aliev

M.S. Student

Hani A. Al Majed

M.S. Student
Electrical and Computer Engineering Master's student at KAUST under the supervision of Professor Bernard Ghanem, with expertise in machine learning workflow automation, physics-informed neural operators, and AI for Science, particularly in chemistry applications. Passionate about leveraging AI to solve complex scientific problems.

Ahmad Sait

M.S. Student, Computer Science
Ahmad Sait is a Master's student in the Computer Science program at KAUST. Before joining KAUST, Ahmad obtained his Bachelor's degree in Computer Science from King Abdulaziz University, Saudi Arabia. Ahmad is also a KAUST Academy graduate from the AI track, having been under the supervision of Prof. Naeemullah Khan. The Academy provided him with seven opportunities to assist in teaching students enrolled in subsequent cohorts.

Perovskites used to make efficient artificial retina

1 min read ·
KAUST researchers have built an artificial electronic retina that mimics the behaviour of the eye’s rod retina cells. Their artificial retina can recognise handwritten numbers.

Juan Pablo Peña (Student)

Juan Pablo Peña is part of the Visiting Students Research Program at King Abdullah University of Science and Technology (KAUST). During his Internship, he is conducting his research at the Sensors Lab, in the Electrical Engineering Department, CEMSE, KAUST. Education and Early Career Juan Pablo Peña graduated from Mecatronichs Engineering B.S. at the National Autonomous University of Mexico, Mexico City on May 2019. Additionally, on 2019 summer he worked on an augmented reality simulation for visual impairments created during his research internship at Ryerson University, Canada. Similarly, on

Abdurauf Abdurakhmanov

<> Electrochemical Sensors (9)

On‐Chip Energy Storage: Integration of Electrochemical Microsupercapacitors with Thin Film Electronics for On‐Chip Energy Storage (Adv. Mater. 25/2019)

1 min read ·
Mrinal K. Hota, et al., "Integration of Electrochemical Microsupercapacitors with Thin Film Electronics for On‐Chip Energy Storage". Advanced Materials 31 (25), 2019, 1807450. In article number 1807450, Khaled N. Salama, Husam N. Alshareef, and co‐workers describe the integration of on‐chip electrochemical microsupercapacitors with thin‐film electronics at the transistor level using a single electrode material (RuO2) for both. The functionality of the integrated devices is successfully demonstrated using alternating signals, which are properly stored, and used to power several electronic

Integration of Electrochemical Microsupercapacitors with Thin Film Electronics for On‐Chip Energy Storage

1 min read ·
Mrinal K. Hota, et al., "Integration of Electrochemical Microsupercapacitors with Thin Film Electronics for On‐Chip Energy Storage". Advanced Materials 31(25), 2019, 1807450. The development of self‐powered electronic systems requires integration of on‐chip energy‐storage units to interface with various types of energy harvesters, which are intermittent by nature. Most studies have involved on‐chip electrochemical microsupercapacitors that have been interfaced with energy harvesters through bulky Si‐based rectifiers that are difficult to integrate. This study demonstrates transistor‐level

A Chitosan Gold Nanoparticles Molecularly Imprinted Polymer Based Ciprofloxacin Sensor

1 min read ·
Sandeep G. Surya, et al., "A Chitosan Gold Nanoparticles Molecularly Imprinted Polymer Based Ciprofloxacin Sensor." RSC Advances 10 (22), 2020, 12823. In this work, we present a novel study on the development of an electrochemical biomimetic sensor to detect the ciprofloxacin (CIP) antibiotic. A chitosan gold nanoparticles decorated molecularly imprinted polymer (Ch-AuMIP) was used to modify the glassy carbon electrode (GCE) for preparation of the sensor. The Ch-AuMIP was characterized to understand various properties like chemical composition, morphology, roughness, and conduction using

A Paper-based Inkjet-printed PEDOT: PSS/ZnO Sol-gel Hydrazine Sensor

1 min read ·
Tutku Beduk, et al., "A Paper-based Inkjet-printed PEDOT: PSS/ZnO Sol-gel Hydrazine Sensor." Sensors and Actuators B: Chemical 306, 2020, 127539. Hydrazine is widely used in industries as a precursor for blowing agents, pharmaceuticals, and pesticides. It is a highly toxic compound; therefore, it is of paramount interest to develop new analytical methods for the detection and control of hydrazine exposure. In this work, we describe the fabrication of an all inkjet-printed paper sensor composed of poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) electrode functionalized with

One-step Electrosynthesized Molecularly Imprinted Polymer on Laser Scribed Graphene Bisphenol A Sensor

1 min read ·
Tutku Beduk, et al., "One-step Electrosynthesized Molecularly Imprinted Polymer on Laser Scribed Graphene Bisphenol A Sensor." Sensors and Actuators B: Chemical 314, 2020, 128026. Bisphenol A (BPA) is a toxic chemical used by industries for production of containers for storage of food and beverages leading to possible health risks. In this work, we present a simple, mask-free, low-cost imprinted sensor based on laser scribed graphene (LSG) technology combined to molecularly imprinted polymers (MIPs) for BPA determination. CO2 laser was used in production of LSG electrodes with high

Fully Inkjet‐Printed, Ultrathin and Conformable Organic Photovoltaics as Power Source Based on Cross‐Linked PEDOT:PSS Electrodes

1 min read ·
Eloïse Bihar, et al., "Fully Inkjet‐Printed, Ultrathin and Conformable Organic Photovoltaics as Power Source Based on Cross‐Linked PEDOT:PSS Electrodes" Advance Material Technology 2000226 , 2020, 1. Ultra‐lightweight solar cells have attracted enormous attention due to their ultra‐conformability, flexibility, and compatibility with applications including electronic skin or miniaturized electronics for biological applications. With the latest advancements in printing technologies, printing ultrathin electronics is becoming now a reality. This work offers an easy path to fabricate indium tin

Laser scribed graphene: A novel platform for highly sensitive detection of eletroactive biomolecules

1 min read ·
Abdelghani Ghanam, et al., "Laser scribed graphene: A novel platform for highly sensitive detection of eletroactive biomolecules" Biosensors and Bioelectronics, 2020, 112509. Laser-scribed graphene electrodes (LSGEs) have recently shown a potential for the development of electrochemical biosensors thanks to their electronic properties, porous structures, and large surface area that can support the charge transfer. In this paper, the authors present a comparative study of the electrochemical performances of LSGEs with the conventional screen-printed carbon electrodes (SPCEs) toward the

Electrochemical sensors and biosensors using laser-derived graphene: A comprehensive review

1 min read ·
Abdellatif Ait Lahcen, et al., "Electrochemical sensors and biosensors using laser-derived graphene: A comprehensive review." Biosensors and Bioelectronics 168, 2020, 112565. Laser-derived graphene (LDG) technology is gaining attention as a promising material for the development of novel electrochemical sensors and biosensors. Compared to established methods for graphene synthesis, LDG provides many advantages such as cost-effectiveness, fast electron mobility, mask-free, green synthesis, good electrical conductivity, porosity, mechanical stability, and large surface area. This review

Abdellatif Ait Lahcen

Postdoctoral Research Fellow, Sensors
Dr. Abdellatif Ait Lahcen is currently a Postdoctoral Research Fellow at the Sensors Lab, in the Electrical Engineering Department, CEMSE, King Abdullah University of Science and Technology (KAUST). Education and Early Career Before joining the King Abdullah University of Science and Technology (KAUST) in Kingdom of Saudi Arabia on March 2019 as a Postdoctoral Research Fellow, I was performing my research at the department of Analytical Chemistry, University of Cadiz (Spain) as well as in the laboratory of Process Engineering and Environment at Hassan II University of Casablanca in Morocco. I
<> CMOS (8)

An integrated energy-efficient capacitive sensor digital interface circuit

1 min read ·
Hesham Omran, et al., "An integrated energy-efficient capacitive sensor digital interface circuit." Sensors and Actuators A: Physical 216, 2014, 43. In this paper, we propose an energy-efficient 13-bit capacitive sensor interface circuit. The proposed design fully relies on successive approximation algorithm, which eliminates the need for oversampling and digital decimation filtering, and thus low-power consumption is achieved. The proposed architecture employs a charge amplifier stage to achieve parasitic insensitive operation and fine absolute resolution. Moreover, the output code is not

A 7.9 pJ/Step Energy-Efficient Multi-Slope 13-bit Capacitance-to-Digital Converter

1 min read ·
Hesham Omran, et al., "7.9 pJ/step energy-efficient multi-slope 13-bit capacitance-to-digital converter." IEEE Transactions on Circuits and Systems II: Express Briefs 61 (8), 2014, 589. In this brief, an energy-efficient capacitance-to-digital converter (CDC) is presented. The proposed CDC uses digitally controlled coarse-fine multi-slope integration to digitize a wide range of capacitance in short conversion time. Both integration current and frequency are scaled, which leads to significant improvement in the energy efficiency of both analog and digital circuitry. Mathematical analysis for

A low‐power 802.11 ad compatible 60‐GHz phase‐locked loop in 65‐nm CMOS

1 min read ·
Hammad M. Cheema, et al., "A low‐power 802.11 ad compatible 60‐GHz phase‐locked loop in 65‐nm CMOS" Microwave and Optical Technology Letters 57 (3), 2015, 660. A 60‐GHz fundamental frequency phase locked loop (PLL) as part of a highly integrated system‐on‐chip transmitter with on‐chip memory and antenna is presented. As a result of localized optimization approach for each component, the PLL core components only consume 30.2 mW from a 1.2 V supply. A systematic design procedure to achieve high phase margin and wide locking range is presented. The reduction of parasitic and fixed capacitance

Wide-range adaptive RF-to-DC power converter for UHF RFIDs

1 min read ·
Mahmoud H. Ouda, et al., "Wide-range adaptive RF-to-DC power converter for UHF RFIDs." IEEE Microwave and Wireless Components Letters 26 (8), 2016, 634. A wide-range, differential, cross-coupled rectifier is proposed with an extended dynamic range of input RF power that enables wireless powering from varying distances. The proposed architecture mitigates the reverse-leakage problem in conventional, cross-coupled rectifiers without degrading sensitivity. A prototype is designed for UHF RFID applications, and is implemented using 0.18 μm CMOS technology. On-chip measurements demonstrate a

Experimental behavior evaluation of series and parallel connected constant phase elements

1 min read ·
Georgia Tsirimokou, et al., "Experimental behavior evaluation of series and parallel connected constant phase elements". AEU-International Journal of Electronics and Communications, 74, 2017, 5. Fractional-order capacitors are the core building blocks for implementing fractional-order circuits. Due to the absence of their commercial availability, they can be approximated through appropriately configured passive or active integer-order element topologies. Such a topology, constructed using Operational Transconductance Amplifiers (OTAs) and capacitors has been implemented in monolithic form

A biosensor-CMOS platform and integrated readout circuit in 0.18-μm CMOS technology for cancer biomarker detection

1 min read ·
Abdulaziz Alhoshany, et al., " A biosensor-CMOS platform and integrated readout circuit in 0.18-μm CMOS technology for cancer biomarker detection". Sensors, 17(9), 2017, 1942. This paper presents a biosensor-CMOS platform for measuring the capacitive coupling of biorecognition elements. The biosensor is designed, fabricated, and tested for the detection and quantification of a protein that reveals the presence of early-stage cancer. For the first time, the spermidine/spermine N1 acetyltransferase (SSAT) enzyme has been screened and quantified on the surface of a capacitive sensor. The sensor

CMOS-RC Colpitts oscillator design using floating fractional-order inductance simulator

1 min read ·
Kartci, Aslihan, et al. "CMOS-RC Colpitts oscillator design using floating fractional-order inductance simulator." IEEE 61st International Midwest Symposium on Circuits and Systems (MWSCAS). IEEE, 2018, 905. This paper deals with CMOS fractional-order inductance (FoL) simulator design and its utilization in 2.75 th order Colpitts oscillator providing high frequency of oscillation. The proposed floating FoL is composed of two unity-gain current followers (CF±s), two inverting voltage buffers, a transconductor, and a fractional-order capacitor (FoC) of order 0.75, while the input intrinsic

Analog backpropagation learning circuits for memristive crossbar neural networks

1 min read ·
Krestinskaya, Olga, "Analog backpropagation learning circuits for memristive crossbar neural networks." 2018 IEEE International Symposium on Circuits and Systems (ISCAS). IEEE, 2018, 1. The implementation of backpropagation algorithm using gradient descent operation with analog circuits is an open problem. In this paper, we present the analog learning circuits for realizing backpropagation algorithm for use with neural networks in memristive crossbar arrays. The circuits are simulated in SPICE using TSMC 180nm CMOS process models, and HP memristor models. The gradient descent operations are
<> memristors (8)

On the mathematical modeling of memristors

1 min read ·
Radwan, Ahmed G., et al., "On the mathematical modeling of memristors." In 2010 International Conference on Microelectronics, 2010, 284. Since the fourth fundamental element (Memristor) became a reality by HP labs, and due to its huge potential, its mathematical models became a necessity. In this paper, we provide a simple mathematical model of Memristors characterized by linear dopant drift for sinusoidal input voltage, showing a high matching with the nonlinear SPICE simulations. The frequency response of the Memristor's resistance and its bounding conditions are derived. The fundamentals of

Mohammed Zidan (EE PhD Candidate) received the best postgraduate poster award at the SIECPS conference

1 min read ·
Mohammed Zidan received the best postgraduate poster award at the second Saudi International Electronics, Communications and Photonics conference, held 27-30 April 2013 in Riyadh, KSA.

Prof. Salama's publications recognized by Elsevier's Top 25 hottest articles list

1 min read ·
Ph.D. student, Mohammed Zidan 's paper on Memristor-based memory: The sneak paths problem and solutions are recognized by ScienceDirect as one of the Top 25 hottest papers.

Towards neuromorphic electronics: Memristors on foldable silicon fabric

1 min read ·
MT Ghoneim, et al., "Towards neuromorphic electronics: Memristors on foldable silicon fabric" Microelectronics Journal 45 (11), 2014, 1392. The advantages associated with neuromorphic computation are rich areas of complex research. We address the fabrication challenge of building neuromorphic devices on structurally foldable platform with high integration density. We present a CMOS compatible fabrication process to demonstrate for the first time memristive devices fabricated on bulk monocrystalline silicon (100) which is next transformed into a flexible thin sheet of silicon fabric with all

Memristors Empower Spiking Neurons With Stochasticity

1 min read ·
Maruan Al-Shedivat, et al., "Memristors empower spiking neurons with stochasticity." IEEE journal on Emerging and Selected Topics in Circuits and Systems 5 (2), 2015, 242. Abstract: Recent theoretical studies have shown that probabilistic spiking can be interpreted as learning and inference in cortical microcircuits. This interpretation creates new opportunities for building neuromorphic systems driven by probabilistic learning algorithms. However, such systems must have two crucial features: 1) the neurons should follow a specific behavioral model, and 2) stochastic spiking should be

Pilot assisted readout for passive memristor crossbars

1 min read ·
Rawan Naous, et al., "Pilot assisted readout for passive memristor crossbars." Microelectronics Journal 54, 2016 48. The high demands for performance and energy efficiency pose significant challenges for computational systems. Memristor-based crossbar architectures are actively considered as vital rivals for the traditional solutions. Nonetheless, density and energy driven passive array structures, that lack a switching control per cell, suffer from sneak paths that limit the range of accurate operation of the crossbar array. In this paper, the crossbar array is treated as a communication

Stochasticity Modeling in Memristors

1 min read ·
Rawan Naous, et al., "Stochasticity modeling in memristors." IEEE Transactions on Nanotechnology 15 (1), 2016, 15. Abstract: Diverse models have been proposed over the past years to explain the exhibiting behavior of memristors, the fourth fundamental circuit element. The models varied in complexity ranging from a description of physical mechanisms to a more generalized mathematical modeling. Nonetheless, stochasticity, a widespread observed phenomenon, has been immensely overlooked from the modeling perspective. This inherent variability within the operation of the memristor is a vital

Mani Teja Vijjapu

Mani Teja did his bachelors in Electronics and communications from Jawaharlal Technological University Anantapur, India in the year 2013. He worked as a research associate for Physical Research Laboratory, India for couple of years. He further continued to work as a research associate at IIT Madras, India. Later he pursued his masters in Solid state electronic devices from National Chiao-Tung University (NCTU), Taiwan and graduated in 2018. His Master’s thesis is focused on fabricating a binary synapse like memristor using atomic layer deposition. He did his summer internship at National
<> wireless powering (8)

EE students win top honors in DOW Sustainability Innovation Student Challenge Award

1 min read ·
EE students Salman Inayat (Prof. Muhammad Hussain's PhD student) and Mahmoud Ouda (Prof. Khaled Salama's PhD student) have won the first and second prizes, respectively, in DOW Sustainability Innovation Student Challenge Award.

Mahmoud Ouda Won The "Best Out Of The Box Solution" Prize At The 18th Microelectronics Olympiad Held In Armenia

1 min read ·
Doctoral student, Mahmoud Ouda, working under the supervision of Prof. Khaled Salama, won "Best out of the box solution" prize at the eighth microelectronics olympiad held October 15-19 in Yerevan, Armenia.

Ms Student wins the First Phase of the 10th Annual International Microelectronics Olympiad of Armenia

1 min read ·
Abdullah Almansouri, a MS student in the electro-physics track within the Electrical Engineering program, won the first phase of the 10th Annual International Microelectronics Olympiad of Armenia.

Self-Biased Differential Rectifier with Enhanced Dynamic Range for Wireless Powering

1 min read ·
Mahmoud H. Ouda, et al., "Self-biased differential rectifier with enhanced dynamic range for wireless powering." IEEE Transactions on Circuits and Systems II: Express Briefs 64, (5), 2017, 515. A self-biased cross-coupled differential rectifier is proposed with enhanced power-conversion efficiency (PCE) over an extended range of input power. A prototype is designed for ultrahigh-frequency (UHF) 433-MHz radio-frequency power-harvesting applications and is implemented using a 0.18-μm CMOS technology. The proposed rectifier architecture is compared with the conventional cross-coupled rectifier

A CMOS RF-to-DC Power Converter With 86% Efficiency and− 19.2-dBm Sensitivity

1 min read ·
Abdullah S. Almansouri, et al., "A CMOS RF-to-DC Power Converter With 86% Efficiency and− 19.2-dBm Sensitivity." IEEE Transactions on Microwave Theory and Techniques 66 (5), 2018, 2409. Abstract: This paper proposes an RF-to-dc power converter for ambient wireless powering that is efficient, highly sensitive, and less dependent on the load resistance with an extended dynamic range. The proposed rectifier utilizes a variable biasing technique to control the conduction of the rectifying transistors selectively, hence minimizing the leakage current; unlike the prior work that has a fixed feedback

A Dual-Mode Nested Rectifier for Ambient Wireless Powering in CMOS Technology

1 min read ·
Abdullah Almansouri, et al., "A Dual-Mode Nested Rectifier for Ambient Wireless Powering in CMOS Technology." IEEE Transactions on Microwave Theory and Techniques, 68 (5) , 2020, 1754. This article proposes (DM) nested radio frequency (RF) rectifier for ambient wireless powering. The proposed architecture utilizes a DM nested feedback circuit to enhance the conductivity of the rectifier at low power while reducing the reverse leakage current at high power by generating supply voltages at the gates of the pMOS rectifying transistors. The proposed rectifier is fabricated in a 65-nm CMOS

Mahmoud Ouda

Postdoctoral Research Fellow, Sensors
Mahmoud Ouda is currently a Postdoctoral Research Associate with the Communications and Signal Processing Group (CSP), Department of Electrical and Electronic Engineering at Imperial College London. He received his Ph.D. from King Abdullah University of Science & Technology (KAUST), Saudi Arabia in 2016, and his M.Sc. and B.Sc. (with honors) both in Electronics and Communications Engineering from Ain Shams University, Cairo, Egypt, in 2011 and 2006 respectively. He was a Graduate Research Assistant with the Sensors Lab. in King Abdullah University of Science & Technology (KAUST) from 2010 to

Abdullah Almansouri

Almansouri is a PhD student in the field of wireless powering and wireless sensing. Education and early career Almansouri received a B.Sc. degree (with honors) in Electronics and Communication Engineering from the Royal Melbourne Institute of Technology University (RMIT), Melbourne, VIC, Australia, in 2013, and the M.S. degree in Electrical Engineering from King Abdullah University of Science and Technology (KAUST), Saudi Arabia, in 2016. Almansouri completed his Ph.D. at KAUST successfully. Research Interests Almansouri’s research interests revolve around wireless sensors, including wireless
<> bioelectronics (7)

KAUST Research Conference 2019: New Trends in Biosensors and Bioelectronics

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KAUST

The “KAUST Research Conference on New Trends in Biosensors and Bioelectronics” aims to give an overview of the most recent efforts in bioelectronics that tackle the “interface” problem and overcome the limits of the current technologies by generating new materials/architectures/device components. With its truly interdisciplinary nature, this conference will bring scientists from different disciplines together.

Mahmoud Ouda Won The "Best Out Of The Box Solution" Prize At The 18th Microelectronics Olympiad Held In Armenia

1 min read ·
Doctoral student, Mahmoud Ouda, working under the supervision of Prof. Khaled Salama, won "Best out of the box solution" prize at the eighth microelectronics olympiad held October 15-19 in Yerevan, Armenia.

KAUST Research Conference 2019: New Trends in Biosensors and Bioelectronics

1 min read ·
The “KAUST Research Conference on New Trends in Biosensors and Bioelectronics” was held in KAUST between the 25th and 27th of February. This yearly event aims to give an overview of the most recent efforts in bioelectronics that tackle the “interface” problem and overcome the limits of the current technologies by generating new materials/architectures/device components. With its truly interdisciplinary nature, this conference will bring scientists from different disciplines together, including Chemistry, Electrical Engineering, Biology, and Material Science, who are at the top of their

Using electronics to solve common biological problems

1 min read ·
What do an electrical engineer, an organic chemist, a materials scientist and a cell biologist all have in common? They invent and improve applications at the interface of biology and electronics.
Montserrat Ramirez de Angel receiving the Best Pitch Award at IEEE 2024 Sensors Conference

Giving voice to the voiceless through assistive technology

2 min read ·
Artificial skin coupled with sensors and machine learning technology allows people with voice disorders to communicate using soundless mouth movements.

Raphaela Kethlim Souza Silva

Raphaela Silva is currently a Master student at the Sensors Lab, in the Electrical Engineering Department, CEMSE, King Abdullah University of Science and Technology (KAUST). Education and Early Career Raphaela Silva received her bachelor degree from the department of Electrical Engineering in Federal University of Rio Grande do Norte, Brazil in 2018. In the following year she joined King Abdullah University of Science and Technology to work under the supervision of Professor Khaled Salama. Previously, in 2018, Raphaela worked during 6 months as a visiting student at KAUST, under the

Mahmoud Ouda

Postdoctoral Research Fellow, Sensors
Mahmoud Ouda is currently a Postdoctoral Research Associate with the Communications and Signal Processing Group (CSP), Department of Electrical and Electronic Engineering at Imperial College London. He received his Ph.D. from King Abdullah University of Science & Technology (KAUST), Saudi Arabia in 2016, and his M.Sc. and B.Sc. (with honors) both in Electronics and Communications Engineering from Ain Shams University, Cairo, Egypt, in 2011 and 2006 respectively. He was a Graduate Research Assistant with the Sensors Lab. in King Abdullah University of Science & Technology (KAUST) from 2010 to
<> energy harvesting (7)

Ms Student wins the First Phase of the 10th Annual International Microelectronics Olympiad of Armenia

1 min read ·
Abdullah Almansouri, a MS student in the electro-physics track within the Electrical Engineering program, won the first phase of the 10th Annual International Microelectronics Olympiad of Armenia.

Fully printed 3D cube-shaped multiband fractal rectenna for ambient RF energy harvesting

1 min read ·
Azamat Bakytbekov, A, et al., "Fully printed 3D cube-shaped multiband fractal rectenna for ambient RF energy harvesting". Nano energy, 53, 2018, 587. The Internet of Things (IoT) is an emerging paradigm that requires billions of wirelessly connected devices in a complex radio-frequency (RF) environment. With such a huge number of devices in this scenario, recharging or replacing batteries becomes impractical. Therefore, powering IoT devices by harvesting energy from ambient sources, such as that available in the RF spectrum, is an attractive solution. The antenna for the RF energy harvester

Saudi researcher’s magnetic skin research garners widespread attention

1 min read ·
Imagine if there was a revolutionary wearable technology that could enable the user to open doors or operate machinery with a simple wave of their hand or a mere blink of their eye? What people might not realize is that this contact-free human-machine technology already exists—and it has been developed right here in a laboratory at KAUST.

Thang Nguyen Quang

Thang Nguyen has recently joined the Sensors group as an Ms/PhD student. Education and early career Thang Nguyen received his BE in Electronics & Communications Engineering (honor program) from HCMUT in 2017. He had served as a research assistant at RFIC Lab, HCMUT for a year before joining KAUST. Research Interests Thang is interested in working in RF energy harvesting and Wireless Sensors Networks. Areas of Expertise and Research Interests RF energy harvesting Wireless Sensor Networks Cognitive Radios Education Profile BE in Electronics & Communications Engineering (honor program), 2017

Jose Ilton De Oliveira Filho

Postdoctoral Research Fellow, Electrical and Computer Engineering
José Ilton is currently a Postdoctoral Fellow in the Electrical and Computer Engineering program, at King Abdullah University of Science and Technology (KAUST). José is focused on instrumentation, prototyping, and communication theory. Education and Early Career José Ilton did his bachelor’s in electrical engineering on the track of Power Systems at Federal University of Piaui with 1.5-year exchange period at Budapest University of Technology and Economics, in 2015. At King Abdullah University of Science and Technology (KAUST) he did his master’s in electrical engineering on the topic of

Esraa Fakeih

Esraa Fakeih is an MS/PhD student in Prof. Khaled Salama’s Sensors group. She is studying electro-physics and is currently working on underwater mechanical rectifiers. Education and early career Esraa obtained her undergraduate degree in Electrical and Computer Engineering from Effat University in 2018. During her studies she undertook a 6-month internship in KAUST where she worked on radio frequency energy harvesting systems. Research Interests Esraa’s research interests include biomedical electronics and energy harvesting. Publications A smart home appliances control system based on digital

Abdullah Almansouri

Almansouri is a PhD student in the field of wireless powering and wireless sensing. Education and early career Almansouri received a B.Sc. degree (with honors) in Electronics and Communication Engineering from the Royal Melbourne Institute of Technology University (RMIT), Melbourne, VIC, Australia, in 2013, and the M.S. degree in Electrical Engineering from King Abdullah University of Science and Technology (KAUST), Saudi Arabia, in 2016. Almansouri completed his Ph.D. at KAUST successfully. Research Interests Almansouri’s research interests revolve around wireless sensors, including wireless
<> FPGA (7)

Generalized Hardware Post Processing Technique for Chaos-Based Pseudorandom Number Generators

1 min read ·
Mohamed L. Barakat, et al., "Generalized Hardware Post Processing Technique for Chaos-Based Pseudorandom Number Generators" ETRI Journal, 35, (3), 2013, 448. Abstract: This paper presents a generalized post‐processing technique for enhancing the pseudorandomness of digital chaotic oscillators through a nonlinear XOR‐based operation with rotation and feedback. The technique allows full utilization of the chaotic output as pseudorandom number generators and improves throughput without a significant area penalty. Digital design of a third‐order chaotic system with maximum function nonlinearity is

Hesham Omran wins the first phase of the 8th Annual International Microelectronics Olympiad of Armenia

1 min read ·
Hesham Omran, a PhD student in Prof Khaled Salama's research group (Sensors Lab) won the the first phase of the 8th Annual International Microelectronics Olympiad of Armenia.

Low-Power Hardware Implementation of a Support Vector Machine Training and Classification for Neural Seizure Detection

1 min read ·
Heba Elhosary, et al., "Low-Power Hardware Implementation of a Support Vector Machine Training and Classification for Neural Seizure Detection." IEEE Transactions on Biomedical Circuits and Systems 13 (6), 2019, 1324. In this paper, a low power support vector machine (SVM) training, feature extraction, and classification algorithm are hardware implemented in a neural seizure detection application. The training algorithm used is the sequential minimal optimization (SMO) algorithm. The system is implemented on different platforms: such as field programmable gate array (FPGA), Xilinx Virtex-7 and

FPGA Implementation of Dynamically Reconfigurable IoT security Module Using Algorithm Hopping

1 min read ·
Shady Soliman, et al., "FPGA Implementation of Dynamically Reconfigurable IoT security Module Using Algorithm Hopping." Integration 68, 2019, 108. Internet of Things (IoT) is a promising technology that is continuously spreading around the world leading to many challenges facing cryptographic designers who are trying to fulfill the security standards of IoT constrained devices. In this work, a new design is proposed that adds a new dimension of security by using the concept of frequency hopping to generate a pseudo-random pattern for switching between 5 lightweight cryptographic ciphers: AEGIS

EANN: Energy Adaptive Neural Networks

1 min read ·
Salma Hassan, et al., "EANN: Energy Adaptive Neural Networks." Electronics 9 (5), 2020, 746. This paper proposes an Energy Adaptive Feedforward Neural Network (EANN). It uses multiple approximation techniques in the hardware implementation of the neuron unit. The used techniques are precision scaling, approximate multiplier, computation skipping, neuron skipping, activation function approximation and truncated accumulation. The proposed EANN system applies the partial dynamic reconfiguration (PDR) feature supported by the FPGA platform to reconfigure the hardware elements of the neural network

Hesham Omran

Research Staff, Sensors
Hesham Omran worked as a Researcher with the Sensors Lab after obtaining his Ph.D. degree in Electrical Engineering under the supervision of Prof. Khaled Nabil Salama from King Abdullah University of Science and Technology (KAUST), Thuwal, Kingdom of Saudi Arabia. He received the B.Sc. (with honors) and M.Sc. degrees from Ain Shams University, Cairo, Egypt, in 2007 and 2010, respectively, both in electrical engineering. From 2008 to 2011, he was a Research and Teaching Assistant with the Integrated Circuits Lab (ICL), Ain Shams University, and a Design Engineer with Si-Ware Systems (SWS)

Abdurauf Abdurakhmanov

<> MOFs (7)

Insights on capacitive interdigitated electrodes coated with MOF thin films: Humidity and VOCs sensing as a case study

1 min read ·
Christos Sapsanis, et al., "Insights on capacitive interdigitated electrodes coated with MOF thin films: Humidity and VOCs sensing as a case study." Sensors 15 (8), 2015, 18153. A prototypical metal-organic framework (MOF), a 2D periodic porous structure based on the assembly of copper ions and benzene dicarboxylate (bdc) ligands (Cu (bdc)· xH 2 O), was grown successfully as a thin film on interdigitated electrodes (IDEs). IDEs have been used for achieving planar CMOS-compatible low-cost capacitive sensing structures for the detection of humidity and volatile organic compounds (VOCs)

H2S Sensors: Fumarate‐Based fcu‐MOF Thin Film Grown on a Capacitive Interdigitated Electrode

1 min read ·
Omar Yassine, et al., " H2S Sensors: Fumarate‐Based fcu‐MOF Thin Film Grown on a Capacitive Interdigitated Electrode". Angewandte Chemie International Edition, 55 (51), 2016, 15879. Herein we report the fabrication of an advanced sensor for the detection of hydrogen sulfide (H2S) at room temperature, using thin films of rare‐earth metal (RE)‐based metal–organic framework (MOF) with underlying fcu topology. This unique MOF‐based sensor is made via the in situ growth of fumarate‐based fcu‐MOF (fum‐fcu‐MOF) thin film on a capacitive interdigitated electrode. The sensor showed a remarkable

MOFs for the sensitive detection of ammonia: Deployment of fcu-MOF thin films as effective chemical capacitive sensors

1 min read ·
Ayalew H. Assen, et al., " MOFs for the sensitive detection of ammonia: Deployment of fcu-MOF thin films as effective chemical capacitive sensors". ACS sensors, 2(9), 2017, 1294. This work reports on the fabrication and deployment of a select metal–organic framework (MOF) thin film as an advanced chemical capacitive sensor for the sensing/detection of ammonia (NH3) at room temperature. Namely, the MOF thin film sensing layer consists of a rare-earth (RE) MOF (RE-fcu-MOF) deposited on a capacitive interdigitated electrode (IDE). Purposely, the chemically stable naphthalene-based RE-fcu-MOF (NDC

Lining MOF pockets to detect noxious gases

1 min read ·
A porous material with tailor-made pockets stitched into its structure is a promising material for sensing noxious gases. A thin film of the material, coated onto an electrode, formed an electronic sensor that could detect traces of sulfur dioxide gas. The sensor is a significant step toward real-world devices that can sniff out dangerous gases in real air. Although several lab-based analytical instruments can detect traces of a specific gas in the air, these instruments are typically large, expensive, power-hungry machines. There is still a need for small, inexpensive, energy-efficient

The quest for highly sensitive QCM humidity sensors: The coating of CNT/MOF composite sensing films as case study

1 min read ·
Karumbaiah N. Chappanda, et al., "The quest for highly sensitive QCM humidity sensors: The coating of CNT/MOF composite sensing films as case study". Sensors and Actuators B: Chemical, 257, 2018, 609. The application of metal-organic frameworks (MOFs) as a sensing layer has been attracting great interest over the last decade, due to their uniform properties in terms of high porosity and tunability, which provides a large surface area and/or centers for trapping/binding a targeted analyte. Here we report the fabrication of a highly sensitive humidity sensor that is based on composite thin films

MOFs can sense and sort troublesome gases

1 min read ·
Fluorinated metal-organic frameworks make excellent materials for selective sensing and removal of toxic gases.

Realization of an Ultrasensitive and Highly Selective OFET NO2 Sensor: The Synergistic Combination of PDVT-10 Polymer and Porphyrin–MOF

1 min read ·
Saravanan Yuvaraja, et al., "Realization of an Ultrasensitive and Highly Selective OFET NO2 Sensor: The Synergistic Combination of PDVT-10 Polymer and Porphyrin–MOF." ACS Applied Materials & Interfaces 12 (16), 2020, 18748. Organic field-effect transistors (OFETs) are emerging as competitive candidates for gas sensing applications due to the ease of their fabrication process combined with the ability to readily fine-tune the properties of organic semiconductors. Nevertheless, some key challenges remain to be addressed, such as material degradation, low sensitivity, and poor selectivity toward
<> deep learning (6) <> embedded systems (5)
Syed Abidullah Fareed

Syed Abidullah Fareed

Visiting Student (former), Information Science Lab

KAUST student wins global sensors and measurement systems competition

1 min read ·
KAUST master's degree student José Ilton de Oliveira Filho recently won first place at the second edition of the IEEE International Sensors and Measurement Systems Student Contest (IEEE IS&M-SC). IEEE IS&M-SC is a global competition directed at teams of advanced undergraduates, master's degree and Ph.D. students and seeks to stimulate creative ideas for sensor and measuring systems applications.

Jose Ilton De Oliveira Filho

Postdoctoral Research Fellow, Electrical and Computer Engineering
José Ilton is currently a Postdoctoral Fellow in the Electrical and Computer Engineering program, at King Abdullah University of Science and Technology (KAUST). José is focused on instrumentation, prototyping, and communication theory. Education and Early Career José Ilton did his bachelor’s in electrical engineering on the track of Power Systems at Federal University of Piaui with 1.5-year exchange period at Budapest University of Technology and Economics, in 2015. At King Abdullah University of Science and Technology (KAUST) he did his master’s in electrical engineering on the topic of

Fellipe Augusto Araújo Leandro

Fellipe received his bachelor degree in Electrical Engineering from Federal University of Rio Grande do Norte (UFRN), Brazil, in 2019. During his undergraduation, he worked in researches related to microcontroller-based embedded systems platforms, with focus in embedded software programming and PCB design. In 2019, he worked as an intern in a startup company developing embedded software for a Lora-based biotelemetry system, and also in another startup developing PCB design for low-cost Educational robotics and electronics. In 2020, he joined KAUST to research under the supervision of Professor

Evangelos Piliouras

Education and early career Evangelos received his integrated master's degree with excellency, from the department of Electrical Engineering and Computer Technology in Patras in 2018. He recently joined King Abdullah University of Science and Technology (KAUST) and he works under the supervision of Prof. Meriem Laleg in the field of estimation. Evangelos did a 3-month internship in Dialog Semiconductor as a software developer, having developed a software automation tool. Research Interests Evangelos' research interests are found in the area of biosensors, embedded system design, modeling and
<> material science and engineering (5) <> Memory (5)

Mohammed Zidan (EE PhD Candidate) received the best postgraduate poster award at the SIECPS conference

1 min read ·
Mohammed Zidan received the best postgraduate poster award at the second Saudi International Electronics, Communications and Photonics conference, held 27-30 April 2013 in Riyadh, KSA.

Memristor-based memory The sneak paths problem and solutions

1 min read ·
Mohammed A. Zidan, et al., "Memristor-based memory The sneak paths problem and solutions" Microelectronics Journal 44, (2), 2013, 176. Abstract: In this paper, we investigate the read operation of memristor-based memories. We analyze the sneak paths problem and provide a noise margin metric to compare the various solutions proposed in the literature. We also analyze the power consumption associated with these solutions. Moreover, we study the effect of the aspect ratio of the memory array on the sneak paths. Finally, we introduce a new technique for solving the sneak paths problem by gating

Prof. Salama's publications recognized by Elsevier's Top 25 hottest articles list

1 min read ·
Ph.D. student, Mohammed Zidan 's paper on Memristor-based memory: The sneak paths problem and solutions are recognized by ScienceDirect as one of the Top 25 hottest papers.

Mohammed Zidan awarded IEEE Circuits and Systems Society Pre-Doctoral Fellowship

1 min read ·
Mohammed Affan Zidan, sensors lab member and Ph.D. candidate in the Electrical Engineering (EE) Program at the Computer, Electrical, and Mathematical Science and Engineering (CEMSE) Division, received the IEEE Circuits and Systems (CAS) Society Pre-Doctoral Fellowship.

Mohammed Affan Zidan

Mohammed Affan Zidan obtained his Ph.D. Degree in the Electrical Engineering (EE) Program from King Abdullah University of Science and Technology, under the supervision of Prof. Khaled Nabil Salama. Mohammed Zidan earned his M.Sc. in Electronics and Communications Engineering from Faculty of Engineering, Cairo University, Egypt in 2010, where he was ranked first. In 2006, he received his B.Sc. in Electronics and Communications Engineering, Institute of Aviation Engineering and Technology (IAET), Egypt, also ranking first. Before joining KAUST, he worked as a teaching assistant at the German
<> microelectronics (5)

Ankit Udai

Visiting Researcher at King Abdullah University of Science and Technology (KAUST)

Implantable and Wearable Microelectronic Devices to Improve Quality of Life for People with Disabilities

-

B3 L5 R5209

Implantable medical devices (IMD) and neuroprostheses are finding applications in new therapies thanks to advancements in microelectronics, sensors, RF communications, and medicine, which have resulted in embedding more functions in IMDs that occupy smaller spaces down to millimeters and consume less power, while offering therapies for more complex diseases and disabilities. I will address the latest developments in key building blocks for state-of-the-art IMDs.

Meet KAUST prospective student: Carlos Augusto Zan Malaguti

1 min read ·
Carlos Augusto Zan Malaguti, 23, from Brazil, obtained his bachelor’s degree in electronics and telecommunications engineering from Sao Paulo State University (UNESP). Carlos will join KAUST in the fall of 2020 as an M.S./Ph.D. candidate in the KAUST Sensors Lab under the supervision of Professor Khaled Nabil Salama.

KAUST ECE alumnus wins Design Automation Conference Under-40 Innovators Award

1 min read ·
Former KAUST Sensors Lab researcher Hesham Omran (Ph.D. ’15) has been named as one of the four winners of the Design Automation Conference (DAC) 2022 Under-40 Innovators Award. The award recognizes the top young innovators who have made a significant impact in the field of design and automation of electronics.

Carlos Augusto Zan Malaguti

Carlos Augusto Zan Malaguti is an M.S./Ph.D. candidate in the KAUST Sensors Lab under the supervision of Professor Khaled Nabil Salama. Education and Early Career Carlos received his bachelor’s degree in Electronics and Telecommunications Engineering from Sao Paulo State University (UNESP), Brazil, in 2020. During his undergrad, Carlos’ work focused on performance research through electrical characterization of 0.13 um SOI MOSFET devices. In the Summer/Fall of 2019, Carlos was a Visiting Student at KAUST, under the supervision of Professor Muhammad M. Hussain. He worked on nanofabrication
<> nanomaterials (5)

Fei Xiang

Microscale Electrostatic Fractional Capacitors using Reduced Graphene Oxide Percolated Polymer Composites

1 min read ·
Amro M Elshurafa, et al., "Microscale Electrostatic Fractional Capacitors using Reduced Graphene Oxide Percolated Polymer Composites" Applied Physics Letters 102, 2013, 232991. Abstract: We show that graphene-percolated polymer composites exhibit fractional capacitance response in the frequency range of 50 kHz–2 MHz. In addition, it is shown that by varying the loading of graphene within the matrix from 2.5% to 12%, the phase can be controllably tuned from −67° to −31°, respectively. The electrostatic fractional capacitors proposed herein are easy to fabricate and offer integration capability

Deposition of nanomaterials: a crucial step in biosensor fabrication

1 min read ·
Ahmed Rafiq , et al., "Deposition of Nanomaterials: a Crucial Step in Biosensor Fabrication". Materials Today Communications 17, 2018, 289. Biosensor development includes the deposition of (nano)materials onto a conductive electrode surface, which is a crucial step for obtaining improved performance from the constructed biosensors. Various methods have been used to create a successful matrix of (nano)materials that ensures proper contact between the material and electrode surface. The purpose of (nano)material deposition is to provide a high surface area to improve the electroanalytical

Veerappan Mani

Research Scientist, Sensors
Dr. Veerappan Mani is currently a Research Scientist at the Sensors Lab, in the Electrical Engineering Department, CEMSE, King Abdullah University of Science and Technology (KAUST). He is one of the world’s top 2% scientists since 2020. Education and Early Career Dr. Veerappan Mani received his Ph.D. from the Department of Chemical Engineering and Biotechnology, National Taipei University of Technology (NTUT), Taiwan in 2014. He worked as a research assistant professor at the Institute of Biochemical and Biomedical Engineering, Taipei Tech, Taiwan, from 2016 to 2019. He was a research visiting

Khalid El Abd

Khalid El Abd is currently a M.S. student Graduand at Sapienza University, Rome, Italy. He has been selected for the Visiting Students Research Program offered by KAUST. During his Internship, he is conducting his research at the Sensors Lab, in the Electrical Engineering Department, CEMSE, King Abdullah University of Science and Technology (KAUST). Education and Early Career Khalid El Abd obtained the B.S. from the Faculty of Civil and Industrial Engineering, Major in Clinical Engineering, Sapienza University of Rome, Italy. After starting his M.S., in Biomedical Engineering at Sapienza
<> AI (4) <> chaotic systems (4)

Mohammed Zidan (EE PhD Candidate) received the best postgraduate poster award at the SIECPS conference

1 min read ·
Mohammed Zidan received the best postgraduate poster award at the second Saudi International Electronics, Communications and Photonics conference, held 27-30 April 2013 in Riyadh, KSA.

Prof. Salama's publications recognized by Elsevier's Top 25 hottest articles list

1 min read ·
Ph.D. student, Mohammed Zidan 's paper on Memristor-based memory: The sneak paths problem and solutions are recognized by ScienceDirect as one of the Top 25 hottest papers.

Mohammed Zidan awarded IEEE Circuits and Systems Society Pre-Doctoral Fellowship

1 min read ·
Mohammed Affan Zidan, sensors lab member and Ph.D. candidate in the Electrical Engineering (EE) Program at the Computer, Electrical, and Mathematical Science and Engineering (CEMSE) Division, received the IEEE Circuits and Systems (CAS) Society Pre-Doctoral Fellowship.

Mohammed Affan Zidan

Mohammed Affan Zidan obtained his Ph.D. Degree in the Electrical Engineering (EE) Program from King Abdullah University of Science and Technology, under the supervision of Prof. Khaled Nabil Salama. Mohammed Zidan earned his M.Sc. in Electronics and Communications Engineering from Faculty of Engineering, Cairo University, Egypt in 2010, where he was ranked first. In 2006, he received his B.Sc. in Electronics and Communications Engineering, Institute of Aviation Engineering and Technology (IAET), Egypt, also ranking first. Before joining KAUST, he worked as a teaching assistant at the German
<> foc (4)

Experimental Verification of a Fractional-Order Wien Oscillator Built Using Solid-State Capacitors

1 min read ·
Kartci, Aslihan, et al. "Experimental Verification of a Fractional-Order Wien Oscillator Built Using Solid-State Capacitors." 2018 IEEE 61st International Midwest Symposium on Circuits and Systems (MWSCAS). IEEE, 2018, 544. A new type of fractional-order capacitors (FOCs) is fabricated using a molybdenum disulfide (MoS 2 )-ferroelectric polymer composite. The phase angle of this FOC's impedance remains constant between 100 Hz and 10MHz with only a small deviation of ±4 degrees. The performance of the fabricated FOCs is further tested using the well-known Wien oscillator. The main motivation of

An ultra-broadband single-component fractional-order capacitor using MoS2-ferroelectric polymer composite

1 min read ·
Agamyrat Agambayev, et al., "An ultra-broadband single-component fractional-order capacitor using MoS2-ferroelectric polymer composite". Applied Physics Letters, 113(9),2018, 093505. The phase angle of a fractional-order capacitor's (FOC) impedance has a constant value between −90°−90° and 0°0°. Maintaining this value over a broad frequency band is of utmost importance since it increases the applicability of the electrical circuit that employs the fractional-order capacitor (FOC). In this work, a molybdenum disulfide (MoS2)-ferroelectric polymer composite is used to design/fabricate an FOC

CMOS-RC Colpitts oscillator design using floating fractional-order inductance simulator

1 min read ·
Kartci, Aslihan, et al. "CMOS-RC Colpitts oscillator design using floating fractional-order inductance simulator." IEEE 61st International Midwest Symposium on Circuits and Systems (MWSCAS). IEEE, 2018, 905. This paper deals with CMOS fractional-order inductance (FoL) simulator design and its utilization in 2.75 th order Colpitts oscillator providing high frequency of oscillation. The proposed floating FoL is composed of two unity-gain current followers (CF±s), two inverting voltage buffers, a transconductor, and a fractional-order capacitor (FoC) of order 0.75, while the input intrinsic

Fractional-Order Hartley Oscillator.

1 min read ·
Agambayev, A., et al., "Fractional-Order Hartley Oscillator". PRIME, 2018, 45. A fractional-order capacitor (FOC) is developed using a Molybdenum disulfide ferroelectric polymer composite. The fabricated FOC exhibits constant phase over five decades between 100 Hz-10 MHz, which is the broadest operating frequency bandwidth reported so far for an FOC. Furthermore, a fractional-order Hartley oscillator is built using this FOC, and provide ten times higher oscillation frequency than the frequency of the conventional Hartley oscillator counterpart.
<> MEMS (4)

Differential RF MEMS interwoven capacitor immune to residual stress warping

1 min read ·
Amro M. Elshurafa, , et al., "Differential RF MEMS interwoven capacitor immune to residual stress warping." Micro & Nano Letters 7 (7), 2012, 658. A RF MEMS capacitor with an interwoven structure is designed, fabricated in the PolyMUMPS process and tested in an effort to address fabrication challenges usually faced in MEMS processes. The interwoven structure was found to offer several advantages over the typical MEMS parallel-plate design including eliminating the warping caused by residual stress, eliminating the need for etching holes, suppressing stiction, reducing parasitics and providing

Low voltage RF MEMS variable capacitor with linear CV response

1 min read ·
Amro Elshurafa, et al., "Low voltage RF MEMS variable capacitor with linear CV response." Electronics letters 48 (7), 2012, 392.. An RF MEMS variable capacitor, fabricated in the PolyMUMPS process and tuned electrostatically, possessing a linear capacitance-voltage response is reported. The measured quality factor of the device was 17 at 1 GHz, while the tuning range was 1.2:1 and was achieved at an actuation DC voltage of 8 V only. Further, the linear regression coefficient was 0.98. The variable capacitor was created such that it has both vertical and horizontal capacitances present. As the

Two-layer radio

1 min read ·
Amro Elshurafa, et al., "Two-layer radio frequency MEMS fractal capacitors in PolyMUMPS for S-band applications." Micro & Nano Letters 7 (5), 2012, 419. In this letter, we fabricate for the first time MEMS fractal capacitors possessing two layers and compare their performance characteristics with the conventional parallel-plate capacitor and previously reported state-of-the-art singlelayer MEMS fractal capacitors. Explicitly, a capacitor with a woven structure and another with an interleaved configuration were fabricated in the standard PolyMUMPS surface micromachining process and tested at S

Abdullah Bukhamsin

Abdullah Bukhamsin is a Ph.D. student at the Sensors Lab, in the Bioengineering Department, under the supervision of Professor Khaled Nabil Salama at KAUST. Prior to this, Abdullah obtained an M.S. Degree in Engineering under the supervision of Professor Jurgen Kosel at King Abdullah University of Science and Technology (KAUST). Education and Early Career Abdullah Bukhamsin received his B.Sc. degree in Bioengineering from Rice University (Houston, Texas) in 2018. Following that, he completed his M.Sc. degree in Electrical Engineering from King Abdullah University of Science and Technology
<> RF (4)

RF MEMS fractal capacitors with high self-resonant frequencies

1 min read ·

RF

Amro Elshurafa, et al., "RF MEMS fractal capacitors with high self-resonant frequencies." Journal of microelectromechanical systems 21, (1), 2011, 10. This letter demonstrates RF microelectromechanical systems (MEMS) fractal capacitors possessing the highest reported self-resonant frequencies (SRFs) in PolyMUMPS to date. Explicitly, measurement results show SRFs beyond 20 GHz. Furthermore, quality factors higher than 4 throughout a band of 1-15 GHz and reaching as high as 28 were achieved. Additional benefits that are readily attainable from implementing fractal capacitors in MEMS are

Low voltage RF MEMS variable capacitor with linear CV response

1 min read ·
Amro Elshurafa, et al., "Low voltage RF MEMS variable capacitor with linear CV response." Electronics letters 48 (7), 2012, 392.. An RF MEMS variable capacitor, fabricated in the PolyMUMPS process and tuned electrostatically, possessing a linear capacitance-voltage response is reported. The measured quality factor of the device was 17 at 1 GHz, while the tuning range was 1.2:1 and was achieved at an actuation DC voltage of 8 V only. Further, the linear regression coefficient was 0.98. The variable capacitor was created such that it has both vertical and horizontal capacitances present. As the

Wide-range adaptive RF-to-DC power converter for UHF RFIDs

1 min read ·
Mahmoud H. Ouda, et al., "Wide-range adaptive RF-to-DC power converter for UHF RFIDs." IEEE Microwave and Wireless Components Letters 26 (8), 2016, 634. A wide-range, differential, cross-coupled rectifier is proposed with an extended dynamic range of input RF power that enables wireless powering from varying distances. The proposed architecture mitigates the reverse-leakage problem in conventional, cross-coupled rectifiers without degrading sensitivity. A prototype is designed for UHF RFID applications, and is implemented using 0.18 μm CMOS technology. On-chip measurements demonstrate a

Fully printed 3D cube-shaped multiband fractal rectenna for ambient RF energy harvesting

1 min read ·
Azamat Bakytbekov, A, et al., "Fully printed 3D cube-shaped multiband fractal rectenna for ambient RF energy harvesting". Nano energy, 53, 2018, 587. The Internet of Things (IoT) is an emerging paradigm that requires billions of wirelessly connected devices in a complex radio-frequency (RF) environment. With such a huge number of devices in this scenario, recharging or replacing batteries becomes impractical. Therefore, powering IoT devices by harvesting energy from ambient sources, such as that available in the RF spectrum, is an attractive solution. The antenna for the RF energy harvester
<> Signal processing (4) <> bioscience (3) <> chaos (3)

Generalized Hardware Post Processing Technique for Chaos-Based Pseudorandom Number Generators

1 min read ·
Mohamed L. Barakat, et al., "Generalized Hardware Post Processing Technique for Chaos-Based Pseudorandom Number Generators" ETRI Journal, 35, (3), 2013, 448. Abstract: This paper presents a generalized post‐processing technique for enhancing the pseudorandomness of digital chaotic oscillators through a nonlinear XOR‐based operation with rotation and feedback. The technique allows full utilization of the chaotic output as pseudorandom number generators and improves throughput without a significant area penalty. Digital design of a third‐order chaotic system with maximum function nonlinearity is

Fully digital jerk-based chaotic oscillators for high throughput pseudo-random number generators up to 8.77 Gbitss

1 min read ·
Abhinav S. Mansingka, et al., "Fully digital jerk-based chaotic oscillators for high throughput pseudo-random number generators up to 8.77 Gbitss" Microelectronics Journal 44, (9), 2013, 744. Abstract: This paper introduces fully digital implementations of four different systems in the 3rd order jerk-equation based chaotic family using the Euler approximation. The digitization approach enables controllable chaotic systems that reliably provide sinusoidal or chaotic output based on a selection input. New systems are introduced, derived using logical and arithmetic operations between two system

Robust fractional-order proportional-integral observer for synchronization of chaotic fractional-order systems

1 min read ·
Ibrahima N' Doye, et al., "Robust fractional-order proportional-integral observer for synchronization of chaotic fractional-order systems", IEEE/CAA Journal of Automatica Sinica 6 (1), 2019, 268. Abstract: In this paper, we propose a robust fractional-order proportional-integral (FOPI) observer for the synchronization of nonlinear fractional-order chaotic systems. The convergence of the observer is proved, and sufficient conditions are derived in terms of linear matrix inequalities (LMIs) approach by using an indirect Lyapunov method. The proposed FOPI observer is robust against Lipschitz
<> communications (3)

Simplified Modal‐Cancellation Approach for Substrate‐Integrated‐Waveguide Narrow‐Band Filter Design

1 min read ·
Sebastian Celis, et al., "Simplified Modal-Cancellation Approach for Substrate-Integrated-Waveguide Narrow-Band Filter Design". Electronics 2020, 9, 962. Current substrate-integrated-waveguide (SIW) filter design methodologies can be extremely computational and time-inefficient when a narrow-band filter is required. A new approach to designing compact, highly selective narrow-band filters based on smartly positioned obstacles is thus presented here. The proposed modal-cancellation approach is achieved by translating or eliminating undesired modes within the frequency of interest. This is

Connect the internet of bodies

1 min read ·
A network of body monitoring devices connected using our own tissue could form the basis for the internet of bodies (IoB).

Sebastian Celis

Sebastian Celis is currently an MS/Ph.D. student at Professor Khaled Nabil Salama's Sensors Lab, in the Electrical Engineering Department, CEMSE division, King Abdullah University of Science and Technology (KAUST). Research Interests Sebastian's research interests include the development of electromagnetic devices for mobile communications and for radar systems, Antennas, GPR, Radars, Distribution Systems, Smart Grids, and 5G. Education and Early Career Sebastian Celis received a B.Sc. degree in electrical and electronics engineering from Universidad de Los Andes, Bogota, Colombia, in 2018
<> digital implementation (3)

Design, implementation and analysis of fully digital 1-D controllable multiscroll chaos

1 min read ·
Abhinav Mansingka, et al., "Design, implementation and analysis of fully digital 1-D controllable multiscroll chaos" ICM 2011 Proceeding, 2011, 1. This paper introduces the fully digital implementation of a 1-D multiscroll chaos generator based on a staircase nonlinearity in the 3rd-order jerk system using the Euler approximation. For the first time, digital design is exploited to provide real-time controllability of (i) number of scrolls, (ii) position in 1-D space, (iii) Euler step size and (iv) system parameter. The effect of variations in these fields on the maximum Lyapunov exponent (MLE)

Analysis of bus width and delay on a fully digital signum nonlinearity chaotic oscillator

1 min read ·
Abhinav Mansingka, et al., "Analysis of bus width and delay on a fully digital signum nonlinearity chaotic oscillator." In 2011 IEEE 54th International Midwest Symposium on Circuits and Systems (MWSCAS), 2011, 1. Abstract: This paper introduces the first fully digital implementation of a 3rd order ODE-based chaotic oscillator with signum nonlinearity. A threshold bus width of 12-bits for reliable chaotic behavior is observed, below which the system output becomes periodic. Beyond this threshold, the maximum Lyapunov exponent (MLE) is shown to improve up to a peak value at 16-bits and

On the short-term predictability of fully digital chaotic oscillators for pseudo-random number generation

1 min read ·
Ahmed G. Radwan, et al., "On the short-term predictability of fully digital chaotic oscillators for pseudo-random number generation." In 2013 IEEE 20th International Conference on Electronics, Circuits, and Systems (ICECS), 2013, 373. This paper presents a digital implementation of a 3rd order chaotic system using the Euler approximation. Short-term predictability is studied in relation to system precision, Euler step size and attractor size and optimal parameters for maximum performance are derived. Defective bits from the native chaotic output are neglected and the remaining pass the NIST SP
<> focs (3)

Tunable fractional-order capacitor using layered ferroelectric polymers

1 min read ·
Agamyrat Agambayev, et al. "Tunable fractional-order capacitor using layered ferroelectric polymers." AIP Advances 7 (9), 2017, 095202. Pairs of various Polyvinylidene fluoride P(VDF)-based polymers are used for fabricating bilayer fractional order capacitors (FOCs). The polymer layers are constructed using a simple drop casting approach. The resulting FOC has two advantages: It can be easily integrated with printed circuit boards, and its constant phase angle (CPA) can be tuned by changing the thickness ratio of the layers. Indeed, our experiments show that the CPA of the fabricated FOCs can

Towards fractional-order capacitors with broad tunable constant phase angles: Multi-walled carbon nanotube-polymer composite as a case study

1 min read ·
Agamyrat Agambayev, et al., "Towards fractional-order capacitors with broad tunable constant phase angles: Multi-walled carbon nanotube-polymer composite as a case study." Journal of Physics D: Applied Physics 51(6), 2018, 065602. In this study, multi-walled carbon nanotube (MWCNT) filled polyevinelidenefluoride-trifluoroethylene-chlorofluoroethylene composites are used to realize fractional-order capacitors (FOCs). A solution-mixing and drop-casting approach is used to fabricate the composite. Due to the high aspect ratio of MWCNTs, percolation regime starts at a small weight percentage (wt%)

Series-, parallel-, and inter-connection of solid-state arbitrary fractional-order capacitors: theoretical study and experimental verification

1 min read ·
Aslihan Kartci, et al., " Series-, parallel-, and inter-connection of solid-state arbitrary fractional-order capacitors: theoretical study and experimental verification". IEEE Access, 6, 2018, 10933. Abstract: In this paper, general analytical formulas are introduced for the determination of equivalent impedance, magnitude, and phase, i.e., order, for n arbitrary fractional-order capacitors (FoCs) connected in series, parallel, and their interconnection. The approach presented helps to evaluate these relevant quantities in the fractional domain, since the order of each element has a
<> haps (3)

Bang Huang

Postdoctoral Research Fellow, Electrical and Computer Engineering
Bang Huang works as a postdoctoral fellow at the Computer Electrical and Mathematical Sciences and Engineering Division (CEMSE), King Abdullah University of Science and Technology (KAUST), under the supervision of Prof. Mohamed-Slim Alouini in the Communication Theory Lab (CTL). Education and Early Career Bang Huang received the M.S. degree (with honors) in electrical engineering and Ph.D degree in information and communication engineering from the School of Information and Communication Engineering (SICE), University of Electronic Science and Technology of China (UESTC), Chengdu, China, in

Xiaowei Pang

Postdoctoral Research Fellow, Electrical and Computer Engineering
Xiaowei Pang is currently a Postdoctoral Research Fellow at the Computer Electrical and Mathematical Sciences and Engineering Division (CEMSE), King Abdullah University of Science and Technology (KAUST), working with Professor Mohamed-Slim Alouini in the Communication Theory Lab (CTL). Education and Early Career Xiaowei Pang received her B.S. degree in Telecommunication Engineering from Northwestern Polytechnical University, Xi'an, China, in 2018, and her Ph.D. degree in Information and Communication Engineering from Dalian University of Technology, Dalian, China, in 2024. From 2021 to 2022
H

Hussein Al-Shatri

I chose KAUST because of its reputation for excellence in research and its recent emphasis on applied research. With my extensive background in both academic research and industrial development, I am excited to contribute my experience and ambition. My goal is to foster new ideas and develop innovative prototypes in the field of wireless communications, which will undoubtedly enhance people's lives.
<> Impedance (3)

On-chip implantable antennas for wireless power and data transfer in a glaucoma monitoring SoC

1 min read ·
Loïc Marnat, et al., "On-chip implantable antennas for wireless power and data transfer in a glaucoma monitoring SoC" IEEE Antennas and Wireless Propagation Letters (11), 2012, 1671. Abstract: For the first time, separate transmit and receive on-chip antennas have been designed in an eye environment for implantable intraocular pressure monitoring application. The miniaturized antennas fit on a 1.4-mm 3 CMOS (0.18 μm) chip with the rest of the circuitry. A 5.2-GHz novel inductive-fed and loaded receive monopole antenna is used for wirelessly powering the chip and is conjugately matched to the

Impedance matching through a single passive fractional element

1 min read ·
Ahmed Radwan, et al., "Impedance matching through a single passive fractional element." In Proceedings of the 2012 IEEE International Symposium on Antennas and Propagation, 2012, 1. For the first time, a generalized admittance Smith chart theory is introduced to represent fractional order circuit elements. The principles of fractional order matching circuits are described. We show that for fractional order α ; 1, a single parallel fractional element can match a wider range of load impedances as compared to its series counterpart. Several matching examples demonstrate the versatility of

5.2-GHz RF Power Harvesting Module in 0.18 μm CMOS for Biomedical Implantable Sensors

1 min read ·
Mahmoud H. Ouda, et al., "5.2-GHz RF Power Harvesting Module in 0.18 μm CMOS for Biomedical Implantable Sensors" IEEE Transactions on Microwave Theory and Techniques 61, (5), 2013, 2177. Abstract: A first fully integrated 5.2-GHz CMOS-based RF power harvester with an on-chip antenna is presented in this paper. The design is optimized for sensors implanted inside the eye to wirelessly monitor the intraocular pressure of glaucoma patients. It includes a five-stage RF rectifier with an on-chip antenna, a dc voltage limiter, two voltage sensors, a low dropout voltage regulator, and MOSCAP based on
<> Implantable devices (3)

EE students win top honors in DOW Sustainability Innovation Student Challenge Award

1 min read ·
EE students Salman Inayat (Prof. Muhammad Hussain's PhD student) and Mahmoud Ouda (Prof. Khaled Salama's PhD student) have won the first and second prizes, respectively, in DOW Sustainability Innovation Student Challenge Award.

Mahmoud Ouda Won The "Best Out Of The Box Solution" Prize At The 18th Microelectronics Olympiad Held In Armenia

1 min read ·
Doctoral student, Mahmoud Ouda, working under the supervision of Prof. Khaled Salama, won "Best out of the box solution" prize at the eighth microelectronics olympiad held October 15-19 in Yerevan, Armenia.

Mahmoud Ouda

Postdoctoral Research Fellow, Sensors
Mahmoud Ouda is currently a Postdoctoral Research Associate with the Communications and Signal Processing Group (CSP), Department of Electrical and Electronic Engineering at Imperial College London. He received his Ph.D. from King Abdullah University of Science & Technology (KAUST), Saudi Arabia in 2016, and his M.Sc. and B.Sc. (with honors) both in Electronics and Communications Engineering from Ain Shams University, Cairo, Egypt, in 2011 and 2006 respectively. He was a Graduate Research Assistant with the Sensors Lab. in King Abdullah University of Science & Technology (KAUST) from 2010 to
<> MATLAB (3) <> nanoelectronics (3)
Montserrat Ramirez de Angel receiving the Best Pitch Award at IEEE 2024 Sensors Conference

A voice to the voiceless: Montserrat Ramirez De Angel takes “Best Pitch” award at IEEE 2024 Sensors Conference

3 min read ·
Montserrat Ramirez de Angel wins the Best Pitch Award at IEEE 2024 Sensors Conference for her innovative work in biosensors and sensor technology.

KAUST Research Conference 2019: New Trends in Biosensors and Bioelectronics

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KAUST

The “KAUST Research Conference on New Trends in Biosensors and Bioelectronics” aims to give an overview of the most recent efforts in bioelectronics that tackle the “interface” problem and overcome the limits of the current technologies by generating new materials/architectures/device components. With its truly interdisciplinary nature, this conference will bring scientists from different disciplines together.

KAUST Research Conference 2019: New Trends in Biosensors and Bioelectronics

1 min read ·
The “KAUST Research Conference on New Trends in Biosensors and Bioelectronics” was held in KAUST between the 25th and 27th of February. This yearly event aims to give an overview of the most recent efforts in bioelectronics that tackle the “interface” problem and overcome the limits of the current technologies by generating new materials/architectures/device components. With its truly interdisciplinary nature, this conference will bring scientists from different disciplines together, including Chemistry, Electrical Engineering, Biology, and Material Science, who are at the top of their
<> neuromorphic computing (3)

Unsupervised adaptive weight pruning for energy-efficient neuromorphic systems Frontiers in Neuroscience, section Neuromorphic Engineering.

1 min read ·
Wenzhe Guo, et al., "Unsupervised Adaptive Weight Pruning for Energy-Efficient Neuromorphic Systems." Frontiers in Neuroscience 14, 2020, 1189. To tackle real-world challenges, deep and complex neural networks are generally used with a massive number of parameters, which require large memory size, extensive computational operations, and high energy consumption in neuromorphic hardware systems. In this work, we propose an unsupervised online adaptive weight pruning method that dynamically removes non-critical weights from a spiking neural network (SNN) to reduce network complexity and improve

Mohammed Affan Zidan

Mohammed Affan Zidan obtained his Ph.D. Degree in the Electrical Engineering (EE) Program from King Abdullah University of Science and Technology, under the supervision of Prof. Khaled Nabil Salama. Mohammed Zidan earned his M.Sc. in Electronics and Communications Engineering from Faculty of Engineering, Cairo University, Egypt in 2010, where he was ranked first. In 2006, he received his B.Sc. in Electronics and Communications Engineering, Institute of Aviation Engineering and Technology (IAET), Egypt, also ranking first. Before joining KAUST, he worked as a teaching assistant at the German

Hasan Erdem Yantir

Postdoctoral Research Fellow, Sensors
Education and early career Hasan Erdem Yantır received the Ph.D. degree in Computer Engineering from the University of California, Irvine, the US and the M.Sc. degree in Computer Engineering from Bogazici University, Istanbul, Turkey. He was an engineer at Ericsson from 2011 to 2012 and at Ford Motor Company from 2012 to 2013. He is currently a postdoctoral research fellow at King Abdullah University of Science and Technology, Thuwal, Saudi Arabia. Research Interests Hasan’s research interests include artificial intelligence, digital IC design, in-memory computing, computer architectures, and
<> NO2 (3)

Highly sensitive and selective SO2 MOF sensor: the integration of MFM-300 MOF as a sensitive layer on a capacitive interdigitated electrode

1 min read ·
Valeriya Chernikova, et al., "Highly sensitive and selective SO2 MOF sensor: the integration of MFM-300 MOF as a sensitive layer on a capacitive interdigitated electrode." Journal of Materials Chemistry A 6(14), 2018, 5550. We report on the fabrication of an advanced chemical capacitive sensor for the detection of sulfur dioxide (SO2) at room temperature. The sensing layer based on an indium metal–organic framework (MOF), namely MFM-300, is coated solvothermally on a functionalized capacitive interdigitated electrode. The fabricated sensor exhibits significant detection sensitivity to SO2 at

Fully Integrated Indium Gallium Zinc Oxide NO2 Gas Detector

1 min read ·
Mani Teja Vijjapu, et al.,"Fully Integrated Indium Gallium Zinc Oxide NO2 Gas Detector." ACS Sensors 5 (4), 2020, 984. We report an amorphous indium gallium zinc oxide (IGZO)-based toxic gas detection system. The microsystem contains an IGZO thin-film transistor (TFT) as a sensing element and exhibits remarkable selectivity and sensitivity to low concentrations of nitrogen dioxide (NO 2). In contrast to existing metal oxide-based gas sensors, which are active either at high temperature or with light activation, the developed IGZO TFT sensor is operable at room temperature and requires only

Realization of an Ultrasensitive and Highly Selective OFET NO2 Sensor: The Synergistic Combination of PDVT-10 Polymer and Porphyrin–MOF

1 min read ·
Saravanan Yuvaraja, et al., "Realization of an Ultrasensitive and Highly Selective OFET NO2 Sensor: The Synergistic Combination of PDVT-10 Polymer and Porphyrin–MOF." ACS Applied Materials & Interfaces 12 (16), 2020, 18748. Organic field-effect transistors (OFETs) are emerging as competitive candidates for gas sensing applications due to the ease of their fabrication process combined with the ability to readily fine-tune the properties of organic semiconductors. Nevertheless, some key challenges remain to be addressed, such as material degradation, low sensitivity, and poor selectivity toward
<> organic field effect transistors (3)

Fully Integrated Organic Field‐Effect Transistor Platform to Detect and to Quantify NO2 Gas

1 min read ·
Saravanan Yuvaraja, et al.,"Fully Integrated Organic Field‐Effect Transistor Platform to Detect and to Quantify NO2 Gas." physica status solidi (RRL)–Rapid Research Letters, 2020, 2000086. Herein, the gas sensing characteristics of PDVT‐10 organic field‐effect transistor (OFET) devices are explored and integrated to build a compact analog‐to‐digital converter (ADC) gas detection system. The electrical characteristics of the pristine PDVT‐10 OFET exhibit I on/I off ratio and threshold voltage as 104 and −12 V, respectively. Through the coating of a metal‐organic framework (MOF) on the surface

Yuvaraj Sivalingam

Yuvaraj Sivalingam is a Research Scientist at the Sensors Lab, Computer, Electrical, and Mathematical Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia. Education and Early Career He received his M.Sc. in Physics in 2007 from Madurai Kamaraj University, India and in 2009 he received his M.Tech. in Sensor System Technology from VIT University (India), with a project entitled “Studies on the development of compositions for hydrogen sensing applications and their relevant instrumentation’. In 2008-2009 during his M.Tech.

Murilo Calil Faleiros

M.S. Student, Bioengineering
Murilo Calil Faleiros is a Medical Physicist, currently a Bioengineering Ms/PhD student at Sensors Lab, King Abdullah University of Science and Technology (KAUST). His areas of focus include Organic Electronics, Organic Transistors, Biosensors and Device developments. Education and Early Career Murilo Calil Faleiros received his bachelor’s degree in Medical Physics from University of São Paulo, Brazil. Research Interests Murilo Calil Faleiros is interested in the development of devices for biomedical applications and organic electronics, such as organic field effect transistors and others
<> PolyMUMPS (3)

Two-layer radio frequency MEMS fractal capacitors in PolyMUMPS for S-band applications

1 min read ·
Amro Elshurafa, et al., "Two-layer radio frequency MEMS fractal capacitors in PolyMUMPS for S-band applications." Micro & Nano Letters 7, (5), 2012, 419. In this Letter, the authors fabricate for the first time MEMS fractal capacitors possessing two layers and compare their performance characteristics with the conventional parallel-plate capacitor and previously reported state-of-the-art single-layer MEMS fractal capacitors. Explicitly, a capacitor with a woven structure and another with an interleaved configuration were fabricated in the standard PolyMUMPS surface micromachining process and

Low voltage RF MEMS variable capacitor with linear CV response

1 min read ·
Amro Elshurafa, et al., "Low voltage RF MEMS variable capacitor with linear CV response." Electronics letters 48 (7), 2012, 392.. An RF MEMS variable capacitor, fabricated in the PolyMUMPS process and tuned electrostatically, possessing a linear capacitance-voltage response is reported. The measured quality factor of the device was 17 at 1 GHz, while the tuning range was 1.2:1 and was achieved at an actuation DC voltage of 8 V only. Further, the linear regression coefficient was 0.98. The variable capacitor was created such that it has both vertical and horizontal capacitances present. As the

Achieving nanoscale horizontal separations in the standard 2 μm PolyMUMPS process

1 min read ·
Amro M Elshurafa, et al., "Achieving nanoscale horizontal separations in the standard 2 μm PolyMUMPS process." Applied Nanoscience 4 (2), 2014, 241. This paper shares with the research community how to achieve, effectively and easily, lateral submicron separations in the standard 2 μm PolyMUMPS process without any fabrication intervention or post-processing, based on the oxide sidewall spacer technique. Thousands of nanoseparations were created and successfully tested by visual inspection and by a simple capacitance measurement. The lateral separations attained were less than 440 nm and
<> prototyping (3)
H

Hussein Al-Shatri

I chose KAUST because of its reputation for excellence in research and its recent emphasis on applied research. With my extensive background in both academic research and industrial development, I am excited to contribute my experience and ambition. My goal is to foster new ideas and develop innovative prototypes in the field of wireless communications, which will undoubtedly enhance people's lives.

KAUST student wins global sensors and measurement systems competition

1 min read ·
KAUST master's degree student José Ilton de Oliveira Filho recently won first place at the second edition of the IEEE International Sensors and Measurement Systems Student Contest (IEEE IS&M-SC). IEEE IS&M-SC is a global competition directed at teams of advanced undergraduates, master's degree and Ph.D. students and seeks to stimulate creative ideas for sensor and measuring systems applications.

Jose Ilton De Oliveira Filho

Postdoctoral Research Fellow, Electrical and Computer Engineering
José Ilton is currently a Postdoctoral Fellow in the Electrical and Computer Engineering program, at King Abdullah University of Science and Technology (KAUST). José is focused on instrumentation, prototyping, and communication theory. Education and Early Career José Ilton did his bachelor’s in electrical engineering on the track of Power Systems at Federal University of Piaui with 1.5-year exchange period at Budapest University of Technology and Economics, in 2015. At King Abdullah University of Science and Technology (KAUST) he did his master’s in electrical engineering on the topic of
<> Reinforcement Learning (3) <> RFICs (3) <> system on chip (3) <> thin films (3)

Meng Tang

Meng Tang’s research focuses on the physics and applications of spintronics, with an emphasis on the experimental exploration of spin-orbit torque phenomena and their applications in developing new types of information storage and processing devices. His work aims to contribute to the advancement of information technology with ultra-low power consumption.

Methanol and Humidity Capacitive Sensors Based on Thin Films of MOF Nanoparticles

1 min read ·
Miguel Andrés, et al., "Methanol and Humidity Capacitive Sensors Based on Thin Films of MOF Nanoparticles." ACS Applied Materials & Interfaces 12 (3) ,2020, 4155. The successful development of modern gas sensing technologies requires high sensitivity and selectivity coupled to cost effectiveness, which implies the necessity to miniaturize devices while reducing the amount of sensing material. The appealing alternative of integrating nanoparticles of a porous metal–organic framework (MOF) onto capacitive sensors based on interdigitated electrode (IDE) chips is presented. We report the

Coating of Conducting and Insulating Threads with Porous MOF Particles through Langmuir-Blodgett Technique

1 min read ·
Sakandar Rauf, et al., "Coating of Conducting and Insulating Threads with Porous MOF Particles through Langmuir-Blodgett Technique." Nanomaterials 11 (1), 2021, 160. The Langmuir-Blodgett (LB) method is a well-known deposition technique for the fabrication of ordered monolayer and multilayer thin films of nanomaterials onto different substrates that plays a critical role in the development of functional devices for various applications. This paper describes detailed studies about the best coating configuration for nanoparticles of a porous metal-organic framework (MOF) onto both insulating or
<> Transistors (3)

Dr Sandeep's review on OFET is out

1 min read ·
We are excited to share our review on Organic Field Effect Transistors sensing platforms. This is Dr Sandeep's first paper with the group and more to come soon. Organic field effect transistors (OFETs) have been the focus of sensing application research over the last two decades. The challenges and possible future directions of OFET arrays in embedded sensing platforms are presented. More details at: Sandeep G.Surya, Harshil N.Raval, Rafiq Ahmad, PrashantSonar, Khaled N.Salama, V.Ramgopal Rao, Organic field effect transistors (OFETs) in environmental sensing and health monitoring: A review

Approximate Computing With Stochastic Transistors’ Voltage Over-Scaling

1 min read ·
Ren Li, et al., "Approximate Computing With Stochastic Transistors’ Voltage Over-Scaling" IEEE Access 7, 2019, 6373. Ubiquitous computing and the ever-rising need for energy efficiency pose challenges in terms of the processing requirements and the corresponding machine complexity. Nonetheless, the nature of the underlying applications, particularly dealing with real-world data, offers alternative paradigms toward the efficient utilization of the available design resources. In this paper, approximate computing is addressed as an accommodating technique that can benefit from the inherent

All‐Oxide Thin Film Transistors and Rectifiers Enabling On‐Chip Capacitive Energy Storage

1 min read ·
Wang Zhenwei, et al., "All‐Oxide Thin Film Transistors and Rectifiers Enabling On‐Chip Capacitive Energy Storage." Advanced Electronic Materials 5 (12), 2019, 1900531. All-oxide, fully-transparent thin film transistors and rectifiers, processed entirely by atomic layer deposition, have been developed for on-chip capacitive energy storage. Fully depleted thin film transistor (TFT) operation is achieved by optimizing the carrier concentration in the ZnO channels. The TFTs show an average saturation mobility of 10.5 cm2 V−1 s−1, a stable positive turn-on voltage of 0.88 V, a low subthreshold
<> Wearable (3) <> wireless (3)

Hardware security and trust for wireless integrated circuits

Prof. Haralampos Stratigopoulos, Sorbonne Université

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B2 5220

Abstract We will discuss Integrated Circuit (IC) security and trust threats and corresponding countermeasures with a focus on wireless ICs. We will present solutions to protect RF transceiver ICs against piracy attempted by malicious System-on-Chip (SoC) integrators, foundries, or end-users via reverse-engineering. We will also present hardware Trojan attacks on RF transceivers aiming at creating a covert channel for stealing sensitive information, i.e., cypher keys. Brief Biography Haralampos-G. Stratigopoulos received the Diploma in electrical and computer engineering from the National

KAUSTat: A Wireless, Wearable, Open-Source Potentiostat for Electrochemical Measurements

1 min read ·
Ahmad Rafiq, et al. "KAUSTat: A Wireless, Wearable, Open-Source Potentiostat for Electrochemical Measurements." 2019 IEEE SENSORS. IEEE 27, 2019, 1. Advanced technology is needed every day for wireless, wearable sensors/potentiostats to record real-time measurements and monitor the chemical processes and physiological signals of the human body. Most of the potentiostats present on the market work as “black boxes” without access to their internal structure and their limited information of circuitry makes it challenging to develop new measurement methods and further integration with other

A Compact, Passive Frequency-Hopping Harmonic Sensor Based on a Microfluidic Reconfigurable Dual-Band Antenna

1 min read ·
Liang Zhu, et al., "A Compact, Passive Frequency-Hopping Harmonic Sensor Based on a Microfluidic Reconfigurable Dual-Band Antenna," IEEE Sensors Journal, 2020, 1. We propose here a fully-passive wireless liquid sensor using a harmonic transponder, which comprises a dual-band microstrip antenna reconfigured by different types of liquids injected in a fluidic cavity. Different from traditional radio-frequency (RF) backscatter sensors, the proposed harmonic-transponder sensor (or harmonic sensor) receives frequency-hopped RF monotones and backscatters their second harmonics, with the peak
<> wireless communications network (3) <> 2D and 3D multiscroll chaos (2)

Fully Digital 1-D, 2-D and 3-D Multiscroll Chaos as Hardware Pseudo Random Number Generators

1 min read ·
Abhinav Mansingka, et al., "Fully digital 1-D, 2-D and 3-D multiscroll chaos as hardware pseudo random number generators." In 2012 IEEE 55th International Midwest Symposium on Circuits and Systems (MWSCAS), 2012, 1180. This paper introduces the first fully digital implementation of 1-D, 2-D and 3-D multiscroll chaos using the sawtooth nonlinearity in a 3rd order ODE with the Euler approximation. Systems indicate chaotic behaviour through phase space boundedness and positive Lyapunov exponent. Low-significance bits form a PRNG and pass all tests in the NIST SP. 800-22 suite without post

Secure Ds-CDMA spreading codes using fully digital multidimensional multiscroll chaos

1 min read ·
Abhinav S. Mansingka, et al., "Secure Ds-CDMA spreading codes using fully digital multidimensional multiscroll chaos." In 2013 IEEE 56th International Midwest Symposium on Circuits and Systems (MWSCAS), 2013, 1334. This paper introduces a generalized fully digital hardware implementation of 1-D, 2-D and 3-D multiscroll chaos through sawtooth nonlinearities in a 3rd order ODE with the Euler approximation, wherein low-significance bits pass all NIST SP. 800-22 tests. The low-significance bits show good performance as spreading code for multiple-access DS-CDMA in AWGN and multipath environments
<> 3D electrodes (2) <> 5G networks (2) <> AI4Science (2) <> Aptasensors (2) <> Biomaterials (2) <> biomedical electronics (2) <> Biomedical Signal Processing (2) <> biotechnology (2) <> cardiovascular (2) <> chemical science (2) <> chemical sensors (2) <> composite magnets (2) <> Computer architecture (2) <> cyber-physical systems (2)

Cross-Layer Security of Embedded and Cyber-Physical Systems

Prof. Mohammad Alfaruque, University of California, Irvine, USA.

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B2 5220

Abstract Cyber-physical systems (CPS) are engineered systems that are built from, and depend upon, the seamless integration of computation and physical components . Embedded systems comprising of hardware and software systems are the major enabling technology for these cyber-physical systems. Today, CPSs can be found in security-sensitive areas such as aerospace, automotive, energy, healthcare, manufacturing transportation, entertainment, and consumer appliances. Compared to the traditional information processing systems, due to the tight interactions between cyber and physical components

Model-based Design of Cyber-physical Systems with Learning Components

Prof. Panagiotis Katsaros, Aristotle University of Thessaloniki

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B2 5220

Abstract Cyber-physical system design involves heterogeneous components for sensing, control, actuation, networking and relies on models for the system’s physical dynamics, and all interactions with its environment. Since safety and security are critical, model-based engineering methods are often used to increase the confidence and guide the validation testing of the system under design. An abundant of results from modern system theory (discrete, continuous and hybrid) provides the foundations for modeling, simulation, testing and formal verification. Mature tools and languages offer advanced
<> cybersecurity (2) <> digital circuits (2) <> electronics (2) <> energy storage (2) <> fractals (2)

Low-voltage puzzle-like fractal microelectromechanial system variable capacitor suppressing pull-in

1 min read ·
Amro M. Elshurafa, et al., "Low-voltage puzzle-like fractal microelectromechanial system variable capacitor suppressing pull-in" Micro & Nano Letters 7, (9), 2012, 965. Abstract: This Letter introduces an electrostatically actuated fractal MEMS variable capacitor that, by utilising the substrate, extends the tuning range (TR) beyond the theoretical limit of 1.5 as dictated by the pull-in phenomenon. The backbone concept behind the fractal varactor is to create a suspended movable plate possessing a specific fractal geometry, and to simultaneously create a bottom fixed plate complementary in

Polarization Insensitive and Transparent Frequency Selective Surface for Dual Band GSM Shielding

1 min read ·
Yiming Yang, et al., "Polarization Insensitive and Transparent Frequency Selective Surface for Dual Band GSM Shielding." IEEE Transactions on Antennas and Propagation, 2020 This paper proposes a single-layer, dual-band, optically transparent frequency selective surface (FSS) for GSM shielding. The design evolves from a fractal cross dipole to achieve dual band response, polarization insensitivity and wide angle of incidence stability with a miniaturized size. A two-axis symmetric structure helps to provide a stable frequency response for incident waves with different polarization angles up to
<> fractional order capacitors (2) <> fractional order parameter (2)

Parametric control on fractional-order response for Lü chaotic system

1 min read ·
Khaled Moaddy, et al., "Parametric control on fractional-order response for Lü chaotic system." In Journal of Physics: Conference Series, 423, (1), 2013, 012024. Abstract. This paper discusses the influence of the fractional order parameter on conventional chaotic systems. These fractional-order parameters increase the system degree of freedom allowing it to enter new domains and thus it can be used as a control for such dynamical systems. This paper investigates the behaviour of the equally-fractional-order Lü chaotic system when changing the fractional-order parameter and determines the

Control and switching synchronization of fractional order chaotic systems using active control technique

1 min read ·
Ahmed G. Radwan, et al., "Control and switching synchronization of fractional order chaotic systems using active control technique." Journal of Advanced Research 5 (1), 2014, 125. This paper discusses the continuous effect of the fractional order parameter of the Lü system where the system response starts stable, passing by chaotic behavior then reaching periodic response as the fractional-order increases. In addition, this paper presents the concept of synchronization of different fractional order chaotic systems using active control technique. Four different synchronization cases are
<> Generative AI and LLMs (2) <> Graphene (2) <> GSM (2) <> Hardware (2)

Hardware security and trust for wireless integrated circuits

Prof. Haralampos Stratigopoulos, Sorbonne Université

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B2 5220

Abstract We will discuss Integrated Circuit (IC) security and trust threats and corresponding countermeasures with a focus on wireless ICs. We will present solutions to protect RF transceiver ICs against piracy attempted by malicious System-on-Chip (SoC) integrators, foundries, or end-users via reverse-engineering. We will also present hardware Trojan attacks on RF transceivers aiming at creating a covert channel for stealing sensitive information, i.e., cypher keys. Brief Biography Haralampos-G. Stratigopoulos received the Diploma in electrical and computer engineering from the National

Hardware Realization of Chaos Based Block Cipher for Image Encryption

1 min read ·
Mohamed L. Barakat, et al., "Hardware realization of chaos based block cipher for image encryption." In ICM 2011 Proceeding, 2011, 1. Unlike stream ciphers, block ciphers are very essential for parallel processing applications. In this paper, the first hardware realization of chaotic-based block cipher is proposed for image encryption applications. The proposed system is tested for known cryptanalysis attacks and for different block sizes. When implemented on Virtex-IV, system performance showed high throughput and utilized small area. Passing successfully in all tests, our system proved to be
<> healthcare (2) <> In-memory computing (2) <> inkjet printing technologies (2)

A Paper-based Inkjet-printed PEDOT: PSS/ZnO Sol-gel Hydrazine Sensor

1 min read ·
Tutku Beduk, et al., "A Paper-based Inkjet-printed PEDOT: PSS/ZnO Sol-gel Hydrazine Sensor." Sensors and Actuators B: Chemical 306, 2020, 127539. Hydrazine is widely used in industries as a precursor for blowing agents, pharmaceuticals, and pesticides. It is a highly toxic compound; therefore, it is of paramount interest to develop new analytical methods for the detection and control of hydrazine exposure. In this work, we describe the fabrication of an all inkjet-printed paper sensor composed of poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) electrode functionalized with

Eloise Bihar

Postdoctoral Research Fellow, Sensors
Eloise is a postdoctoral fellow specialized in the field of Printed electronics for biomedical applications. Education and early career Eloise received her M.Sc. in engineering, from Grenoble INP-Pagora, in Grenoble, France, in 2010. She later received her PhD. in bioelectronics from Ecole des Mines de Saint Etienne in France in 2016 under the guidance of Prof. George Malliaras. She is currently working in Prof. Khaled Salama’s group, in collaboration with the groups of Prof. Inal and Prof. Baran. Research Interests Eloise’s current research focuses on the fabrication of printed autonomous
<> integrated circuits (2) <> IOPM (2)

Implantable intraocular pressure monitoring systems: Design considerations

1 min read ·
Muhammad Arsalan, et al., "Implantable intraocular pressure monitoring systems: Design considerations." In 2013 IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-BIO), 2013, 1. Design considerations and limitations of implantable Intraocular Pressure Monitoring (IOPM) systems are presented in this paper. Detailed comparison with the state of the art is performed to highlight the benefits and challenges of the proposed design. The system-on-chip, presented here, is battery free and harvests energy from incoming RF

A 5.2 GHz, 0.5 mW RF powered wireless sensor with dual on-chip antennas for implantable intraocular pressure monitoring

1 min read ·
Mohamed Arsalan, et al., "A 5.2 GHz, 0.5 mW RF powered wireless sensor with dual on-chip antennas for implantable intraocular pressure monitoring." In 2013 IEEE MTT-S International Microwave Symposium Digest (MTT), 2013, 1. For the first time a single chip implantable wireless sensor system for Intraocular Pressure Monitoring (IOPM) is presented. This system-on-chip (SoC) is battery-free and harvests energy from incoming RF signals. The chip is self-contained and does not require external components or bond wires to function. This 1.4mm 3 SoC has separate 2.4GHz-transmit and 5.2GHz-receive
<> ISAC (2) <> Laser-scribed graphene (2)

Laser scribed graphene: A novel platform for highly sensitive detection of eletroactive biomolecules

1 min read ·
Abdelghani Ghanam, et al., "Laser scribed graphene: A novel platform for highly sensitive detection of eletroactive biomolecules" Biosensors and Bioelectronics, 2020, 112509. Laser-scribed graphene electrodes (LSGEs) have recently shown a potential for the development of electrochemical biosensors thanks to their electronic properties, porous structures, and large surface area that can support the charge transfer. In this paper, the authors present a comparative study of the electrochemical performances of LSGEs with the conventional screen-printed carbon electrodes (SPCEs) toward the

Electrochemical sensors and biosensors using laser-derived graphene: A comprehensive review

1 min read ·
Abdellatif Ait Lahcen, et al., "Electrochemical sensors and biosensors using laser-derived graphene: A comprehensive review." Biosensors and Bioelectronics 168, 2020, 112565. Laser-derived graphene (LDG) technology is gaining attention as a promising material for the development of novel electrochemical sensors and biosensors. Compared to established methods for graphene synthesis, LDG provides many advantages such as cost-effectiveness, fast electron mobility, mask-free, green synthesis, good electrical conductivity, porosity, mechanical stability, and large surface area. This review
<> LiDAR (2) <> Localization (2) <> LSG (2) <> material science (2) <> Mathematical modeling (2) <> metal-organic framework (2) <> microfluidic (2)

A “Twisted” Microfluidic Mixer with “Turbulent” Fluidic Flow for Wide Range of Flowrate Applications

1 min read ·
Sivashankar Shilpa, et al., "A “Twisted” Microfluidic Mixer with “Turbulent” Fluidic Flow for Wide Range of Flowrate Applications." Biomicrofluidics 10, 2016, 034120. This paper proposes a new “twisted” 3D microfluidic mixer fabricated by a laser writing/microfabrication technique. Effective and efficient mixing using the twisted micromixers can be obtained by combining two general chaotic mixing mechanisms: splitting/recombining and chaotic advection. The lamination of mixer units provides the splitting and recombination mechanism when the quadrant of circles is arranged in a two-layered

A hybrid modular microfluidic device for emulsion generation

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Zhengyuan Zhou, et al., "A hybrid modular microfluidic device for emulsion generation". Sensors and Actuators A: Physical 280, 2018, 422. We report a novel modular plug-and-play microfluidic device for versatile emulsion generation, which consists of three parts: a top module for the dispersed phase supply, a glass capillary for emulsion creation and a bottom module for the continuous phase supply. By combining different modules and tapered glass capillaries, single emulsions, Janus emulsions and double emulsions have been successfully produced. The hybrid strategy allows us to produce smaller
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One-step Electrosynthesized Molecularly Imprinted Polymer on Laser Scribed Graphene Bisphenol A Sensor

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Tutku Beduk, et al., "One-step Electrosynthesized Molecularly Imprinted Polymer on Laser Scribed Graphene Bisphenol A Sensor." Sensors and Actuators B: Chemical 314, 2020, 128026. Bisphenol A (BPA) is a toxic chemical used by industries for production of containers for storage of food and beverages leading to possible health risks. In this work, we present a simple, mask-free, low-cost imprinted sensor based on laser scribed graphene (LSG) technology combined to molecularly imprinted polymers (MIPs) for BPA determination. CO2 laser was used in production of LSG electrodes with high

Abdellatif Ait Lahcen

Postdoctoral Research Fellow, Sensors
Dr. Abdellatif Ait Lahcen is currently a Postdoctoral Research Fellow at the Sensors Lab, in the Electrical Engineering Department, CEMSE, King Abdullah University of Science and Technology (KAUST). Education and Early Career Before joining the King Abdullah University of Science and Technology (KAUST) in Kingdom of Saudi Arabia on March 2019 as a Postdoctoral Research Fellow, I was performing my research at the department of Analytical Chemistry, University of Cadiz (Spain) as well as in the laboratory of Process Engineering and Environment at Hassan II University of Casablanca in Morocco. I
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Experimental Verification of a Fractional-Order Wien Oscillator Built Using Solid-State Capacitors

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Kartci, Aslihan, et al. "Experimental Verification of a Fractional-Order Wien Oscillator Built Using Solid-State Capacitors." 2018 IEEE 61st International Midwest Symposium on Circuits and Systems (MWSCAS). IEEE, 2018, 544. A new type of fractional-order capacitors (FOCs) is fabricated using a molybdenum disulfide (MoS 2 )-ferroelectric polymer composite. The phase angle of this FOC's impedance remains constant between 100 Hz and 10MHz with only a small deviation of ±4 degrees. The performance of the fabricated FOCs is further tested using the well-known Wien oscillator. The main motivation of

An ultra-broadband single-component fractional-order capacitor using MoS2-ferroelectric polymer composite

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Agamyrat Agambayev, et al., "An ultra-broadband single-component fractional-order capacitor using MoS2-ferroelectric polymer composite". Applied Physics Letters, 113(9),2018, 093505. The phase angle of a fractional-order capacitor's (FOC) impedance has a constant value between −90°−90° and 0°0°. Maintaining this value over a broad frequency band is of utmost importance since it increases the applicability of the electrical circuit that employs the fractional-order capacitor (FOC). In this work, a molybdenum disulfide (MoS2)-ferroelectric polymer composite is used to design/fabricate an FOC
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