Spectrum band selection in delay-QoS constrained cognitive radio networks 1 min read · Sun, Apr 26 2015 News Circuits cognitive radio secondary users SUs multiple spectrum bands 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
Memristors Empower Spiking Neurons With Stochasticity 1 min read · Sun, Apr 26 2015 News Circuits Spiking Neurons Stochasticity memristors 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
A low‐power 802.11 ad compatible 60‐GHz phase‐locked loop in 65‐nm CMOS 1 min read · Sun, Apr 26 2015 News Circuits CMOS 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
Thin PZT‐based ferroelectric capacitors on flexible silicon for nonvolatile memory applications 1 min read · Sun, Apr 26 2015 News Thin PZT‐based ferroelectric capacitors silicon memory applications Mohamed T. Ghoneim, et al., "Thin PZT‐based ferroelectric capacitors on flexible silicon for nonvolatile memory applications." Advanced Electronic Materials 1 (6), 2015, 1500045. A flexible version of traditional thin lead zirconium titanate ((Pb1.1Zr0.48Ti0.52O3)‐(PZT)) based ferroelectric random access memory (FeRAM) on silicon shows record performance in flexible arena. The thin PZT layer requires lower operational voltages to achieve coercive electric fields, reduces the sol‐gel coating cycles required (i.e., more cost‐effective), and, fabrication wise, is more suitable for further scaling
Insights on capacitive interdigitated electrodes coated with MOF thin films: Humidity and VOCs sensing as a case study 1 min read · Sun, Apr 26 2015 News Circuits MOFs 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)
Flexible low-cost cardiovascular risk marker biosensor for point-of-care applications 1 min read · Sun, Apr 26 2015 News cardiovascular risk marker Biosensors 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
This is your light speaking, how can I help you? 1 min read · Sun, Mar 29 2015 News sensors lab-on-a-chip antenna arrays 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.
KAUST post-doctoral fellow wins science photography competition 1 min read · Thu, Jan 15 2015 News science photography A photograph of KAUST post-doctoral fellow Dr. Shilpa Sivashankar's research work has won the "Under the Looking Glass: Art from the World of Small Science" photography competition at the 18th International Conference on Miniaturized Systems for Chemistry and Life Sciences (MicroTAS 2014).
Graphene is taking charge 1 min read · Mon, Dec 22 2014 News electronics Graphene material science and engineering Graphene-based capacitors prove useful in advanced non-linear electronics.
A novel design of antenna array developed by KAUST scientists 1 min read · Tue, Oct 21 2014 News RFICs sensors lab-on-a-chip antenna arrays nonlinear models 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.
Prof. Khaled Salama's Work On Fractional Order Element Based Impedance Matching, Granted US Patent US 8762114 1 min read · Wed, Jul 16 2014 News sensors antenna arrays lab-on-a-chip Prof. Khaled Salama in collaboration with Dr. Ahmed Radwan and Prof. Atif Shamim obtained a US Patent
Achieving nanoscale horizontal separations in the standard 2 μm PolyMUMPS process 1 min read · Tue, Apr 29 2014 News Circuits PolyMUMPS nanoseparations 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 · Tue, Apr 29 2014 News hcs lns Circuits 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
Control and switching synchronization of fractional order chaotic systems using active control technique 1 min read · Sun, Apr 27 2014 News fractional order parameter Lü system Circuits 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
Hardware stream cipher with controllable chaos generator for colour image encryption 1 min read · Sun, Apr 27 2014 News chaos generator Circuits colour image encryption 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
Memristor Multi-Port Readout: A Closed-Form Solution for Sneak-Paths 1 min read · Sat, Apr 26 2014 News Synopsys HSPICE Circuits 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 · Sat, Apr 26 2014 News cdc Circuits CMOS 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
An integrated energy-efficient capacitive sensor digital interface circuit 1 min read · Sat, Apr 26 2014 News Circuits CMOS 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
Ultrafast nonlinear response of gold gyroid three-dimensional metamaterials 1 min read · Sat, Apr 26 2014 News three-dimensional gyroidal metamaterials nonlinear optical response Circuits 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
A family of memristor‐based reactance‐less oscillators 1 min read · Sat, Apr 26 2014 News Oscillators Circuits memristor‐based reactance‐less 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
Mohammed Zidan awarded IEEE Circuits and Systems Society Pre-Doctoral Fellowship 1 min read · Sat, Apr 19 2014 News Spotlight memristor Memory chaotic systems 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.
Towards neuromorphic electronics: Memristors on foldable silicon fabric 1 min read · Wed, Jan 1 2014 News Circuits silicon fabric memristors neuromorphic electronics 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
Prof. Khaled Salama appointed Associate Editor for IEEE Transactions on Circuits and Systems II: Express Briefs 1 min read · Mon, Dec 16 2013 Spotlight News sensors lab-on-a-chip antenna arrays 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.
Memristor-based memory The sneak paths problem and solutions 1 min read · Sat, Oct 26 2013 News Circuits Sneak paths memristor Memory Memory array 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
50V All-PMOS Charge Pumps Using Low-Voltage Capacitors 1 min read · Sat, Oct 26 2013 News Threshold voltage Circuits Charge pumps Logic gates 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
Mahmoud Ouda Won The "Best Out Of The Box Solution" Prize At The 18th Microelectronics Olympiad Held In Armenia 1 min read · Wed, Oct 23 2013 News Spotlight wireless powering Implantable devices bioelectronics 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.
Prof. Salama's publications recognized by Elsevier's Top 25 hottest articles list 1 min read · Tue, Sep 24 2013 News memristors Memory chaotic systems 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.
Hesham Omran wins the first phase of the 8th Annual International Microelectronics Olympiad of Armenia 1 min read · Sun, Sep 15 2013 News Spotlight integrated circuits FPGA 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.
5.2-GHz RF Power Harvesting Module in 0.18 μm CMOS for Biomedical Implantable Sensors 1 min read · Wed, Sep 4 2013 News Circuits monitoring sensors Voltage control Impedance Antennas 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
Dr. Atif Shamim appointed Associate Editor for IEEE Transactions on Antennas & propagation 1 min read · Wed, Aug 21 2013 Spotlight News sensors RFICs 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".
Fully digital jerk-based chaotic oscillators for high throughput pseudo-random number generators up to 8.77 Gbitss 1 min read · Sat, Jul 20 2013 News NIST Circuits chaos Field programmable gate array Random number generator Lyapunov exponent 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
Microscale Electrostatic Fractional Capacitors using Reduced Graphene Oxide Percolated Polymer Composites 1 min read · Mon, Jun 10 2013 News Circuits Oxides Ultracapacitors Graphene Inductors Polymers nanomaterials 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
Generalized Hardware Post Processing Technique for Chaos-Based Pseudorandom Number Generators 1 min read · Sat, Jun 1 2013 News Circuits post‐processing chaos pseudorandom number generator FPGA 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 1 min read · Tue, May 21 2013 News Circuits Reactance-less oscillator memristor Memristive circuits Relaxation oscillator 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
Modeling and fabrication of an RF MEMS variable capacitor with a fractal geometry 1 min read · Sat, May 11 2013 News Circuits 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
Mohammed Zidan (EE PhD Candidate) received the best postgraduate poster award at the SIECPS conference 1 min read · Fri, May 3 2013 News memristors Memory chaotic systems 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.
Parametric control on fractional-order response for Lü chaotic system 1 min read · Sat, Apr 27 2013 News fractional order parameter Circuits 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
A 5.2 GHz, 0.5 mW RF powered wireless sensor with dual on-chip antennas for implantable intraocular pressure monitoring 1 min read · Sat, Apr 27 2013 News IOPM system-on-chip SoC 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
ISAT: The mega-fauna acoustic tracking system 1 min read · Sat, Apr 27 2013 News Circuits ooa isat 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
Secure Ds-CDMA spreading codes using fully digital multidimensional multiscroll chaos 1 min read · Sat, Apr 27 2013 News Circuits fully digital hardware implementation of 1-D 2D and 3D multiscroll chaos 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 1 min read · Sat, Apr 27 2013 News Circuits digital implementation Euler approximation 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
Implantable intraocular pressure monitoring systems: Design considerations 1 min read · Sat, Apr 27 2013 News Circuits IOPM 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
Fibonacci-based hardware post-processing for non-autonomous signum hyperchaotic system 1 min read · Sat, Apr 27 2013 News PRNG Circuits hyperchaotic LFSR 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
EE students, postdocs shine in WEP poster competition 1 min read · Sun, Jan 27 2013 News Spotlight WEP Poster Competition EE students and postdocs won 5 out of 9 prizes at the WEP university-wide poster competition in all three categories. These prizes are the latest in a series of awards brought home by the EE students from similar contests.
EE students win top honors in DOW Sustainability Innovation Student Challenge Award 1 min read · Wed, Oct 17 2012 News Spotlight wireless powering Implantable devices thermoelectric power harvesters 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 wins the second place in the 7th Annual International Microelectronics Olympiad 1 min read · Sat, Oct 6 2012 News Wireless sensors rf signals Computer, Electrical and Mathematical Sciences & Engineering doctoral student, Mahmoud Ouda, won the second place at the seventh Annual International Microelectronics Olympiad that took place in Armenia.
Low-voltage puzzle-like fractal microelectromechanial system variable capacitor suppressing pull-in 1 min read · Thu, Oct 4 2012 News fractals Circuits microactuators 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
A Best-First Soft/Hard Decision Tree Searching MIMO Decoder for a 4×4 64-QAM System 1 min read · Wed, Jul 18 2012 News Circuits MIMO Bit error rate Measurement Decoding Signal to noise ratio Throughput 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
RF MEMS fractal capacitors with high self-resonant frequencies 1 min read · Fri, Apr 27 2012 News 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
Controllable V-Shape Multi-Scroll Butterfly Attractor: System and Circuit Implementation 1 min read · Fri, Apr 27 2012 News V-shape multiscroll attractor symmetrical unsymmetrical attractors Mohamed Zidan, et al., "Controllable V-shape multiscroll butterfly attractor: system and circuit implementation." I nternational Journal of Bifurcation and Chaos 22 (06), 2012, 1250143. In this paper, a new controllable V-shape multiscroll attractor is presented, where a variety of symmetrical and unsymmetrical attractors with a variable number of scrolls can be controlled using new staircase nonlinear function and the parameters of the system. This attractor can be used to generate random signals with a variety of symbol distribution. Digital implementation of the proposed generator is also
