News

April 2012

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

1 min read · Fri, Apr 27 2012

News

Circuits 2D and 3D multiscroll chaos

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
Two-layer radio

1 min read · Fri, Apr 27 2012

News

two layers Circuits MEMS fractal capacitors

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
Non linear dynamics of memristor based 3rd order oscillatory system

1 min read · Fri, Apr 27 2012

News

memristor Circuits oscillatory system nonlinear dynamics

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
Low voltage RF MEMS variable capacitor with linear CV response

1 min read · Fri, Apr 27 2012

News

RF MEMS variable capacitor PolyMUMPS

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 frequency MEMS fractal capacitors in PolyMUMPS for S-band applications

1 min read · Fri, Apr 27 2012

News

r S-band applications Circuits PolyMUMPS

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
Memristor: the illusive device

1 min read · Fri, Apr 27 2012

News

memristor Circuits

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.
Determination of maximum power transfer conditions of bimorph piezoelectric energy harvesters

1 min read · Fri, Apr 27 2012

News

Circuits Power Transfer

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

1 min read · Fri, Apr 27 2012

News

tracking marine The iiSAT Circuits

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
Differential RF MEMS interwoven capacitor immune to residual stress warping

1 min read · Fri, Apr 27 2012

News

Differential RF Circuits MEMS interwoven capacitor immune residual stress warping

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

1 min read · Fri, Apr 27 2012

News

memristor mono-stable oscillator Circuits

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.
Impedance matching through a single passive fractional element

1 min read · Fri, Apr 27 2012

News

Impedance Circuits single passive fractional element

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
Seven tutorials

1 min read · Fri, Apr 27 2012

News

Igor M Filanovsky, et al., "Seven tutorials." In 2012 IEEE 55th International Midwest Symposium on Circuits and Systems (MWSCAS), 2012, 1. These tutorials discusses the following: Operational Amplifiers: Theory, Design and Applications; Reversible Logic: Basics, Prospects in Emerging Nanotechnologies and Challenges in Future; Digital Signal Processing for Communications; Recent Advances on Nyquist and Oversampled Analog-to-Digital Converters; Audio Steganography for Watermarking, Data Embedding and Covert Communication; Delta-Sigma Analog-to-Digital Converters - From System Architecture to
All-pMOS 50-V charge pumps using low-voltage capacitors

1 min read · Fri, Apr 27 2012

News

high-voltage charge pumps

Ahmed Emira, et al., "All-pMOS 50-V charge pumps using low-voltage capacitors." IEEE Transactions on Industrial Electronics 60, no. 10 (2012): 4683-4693. 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
Effect of boundary on controlled memristor-based oscillator

1 min read · Fri, Apr 27 2012

News

Circuits memristor-based oscillator

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
Memristor-based relaxation oscillators using digital gates

1 min read · Fri, Apr 27 2012

News

memristor Circuits relaxation oscillators digital gates

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

1 min read · Fri, Apr 27 2012

News

Circuits RL circuits order RC

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

1 min read · Mon, Apr 16 2012

News

Antenna radiation patterns System-on-a-chip Impedance Wireless communication Biomedical monitoring

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

February 2012

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

1 min read · Wed, Feb 1 2012

News

Circuits Non-standard finite deference scheme Neuron system Fractional differential equation Chaotic synchronization

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

May 2011

April 2011

May 2010

April 2010