1. Nonlinear Electronics: a Linear Time-Varying Circuit Approach - F. L. Neerhoff; P. Van Der Kloet; A. Van Staveren; C. J. M. Verhoeven
Given a nonlinear electronic circuit, an associated linear time-varying small-signal circuit is formally derived by the tableau-method. It has the same topology as the original circuit while each original circuit element is replaced by an incremental one, evaluated along the signal-dependent nonlinear circuit solution. Since the variational circuit is linear in the first place, the designer is now invited to use the results of linear circuit theory. Furthermore, we present time-discrete companion models of linear time-varying elements. By them, the small-signal circuit equations can be e#ciently solved numerically. Keywords--- Nonlinear electronic circuit design, linear time-varying small-signal circuits. I. Introduction Recently,...

2. PERFORMANCE ANALYSIS OF PARALLEL NON- ORTHOGONAL PEEC-BASED SOLVER FOR EMC APPLICATIONS - D. Daroui; J. Ekman
Element Equivalent Circuit (PEEC)-based solver that can handle electromagnetic problems with non-orthogonal structures is presented in this paper. The solver has been written in C++ and employs GMM++ and ScaLAPACK computational libraries to make the solver fast, efficient, and adaptable to current parallel computer systems. The parallel PEEC-based solver has been tested and studied on high performance computing clusters and the correctness of the solver has been verified by doing comparisons between results from orthogonal routines and also another type of electromagnetic solver, namely FEKO. Two non-orthogonal numerical test cases have been analysed in the time and frequency domain. The...

3. 2Laboratoire de Mécanique et de Modélisation des Systèmes Physiques - Désiré Ndjanfang; David Yemélé; Patrick Marquié; Timoléon C. Kofané
Abstract—A nonlinear electrical transmission line with an intersite circuit element acting as a nonlinear resistance is introduced and investigated. In the continuum limit, the dynamics of localized signals is described by a nonlinear evolution equation belonging to the family of nonlinear diffusive Burgers ’ equations. This equation admits compact pulse solutions and shares some symmetry properties with the Rosenau-Hyman K(2, 2) equation. An exact discrete compactlysupported signal voltage is found for the network and the dissipative effects on the pulse motion analytically studied. Numerical simulations confirm the validity of analytical results and the robustness of these compact pulse signals which...

4. Design of Universal Shift Register Using Reversible Logic 1 - Md. Selim; Al Mamun; Indrani Mandal
Reversible sequential circuits are considered the significant memory block for their ultra-low power consumption. Universal shift register is an important memory element of the sequential circuit family. In this paper we proposed efficient design of reversible universal shift register that is optimized in terms of quantum cost, delay and garbage outputs. Appropriate theorems and lemmas are presented to clarify the proposed designs and establish its efficiency.

5. Propuesta de un sistema de distribución de energía eléctrica en media tensión para una institución educativa - Almeida, Eduardo; González, Christian
El Consejo Directivo de la Universidad Nacional Experimental Politécnica Vicerrectorado Barquisimeto (UNEXPO VRB), decidió mejorar las condiciones de la red de distribución de energía eléctrica de media tensión del recinto universitario. Así que se comenzó a realizar una propuesta de un sistema de distribución de energía eléctrica en media tensión para la universidad que satisfaga todos los requisitos pautados en el Plan Maestro que contempla todas las modificaciones y crecimiento de la UNEXPO VRB, además este sistema de distribución cumplirá con todos los criterios de diseño de la empresa CORPOELEC – LARA. La propuesta se comenzó con el estudio del...

6. Adaptive FIR filter. - Ulrich Menzi; George S. Moschytz
Abstract-The implementation of adaptive FIR filters based on the LMS algorithm using SC circuits is described. The filters consist of the basic elements: delay element, summing circuit, integrator, and multiplier. In an error analysis, the influence of nonideal effects of SC networks on the behavior of a given filter is investigated. It is shown that the nonidealities in the FIR filter part of the circuit can be eliminated by an additional constant tap element, whereas the main error source in the adaptation part are the multiplier- and integrator offset-errors, which can be compensated using special offset-free circuits. Using the proposed...

7. Unified Cellular Neural Network Cell Dynamical Equation Using Delta Operator - George S. Moschytz
ABSTRACT: The signal processing algorithms based on conventional shift operator tend to be ill-conditioned in situations involving fast sampling and shorter wordlength. To alleviate this problem delta operator based analysis and design has been proposed for high speed digital signal processing and control systems. The advantage for delta (8) operator seems to come from the fact as sampling period T,+ O, the discrete time system process resembles that of continuous time system. In this paper we develop a unified cellular neural network (CNN) cell model using the delta operator approach. The model gives a general discrete-time (DT) CNN cell dynamics...

8. Inductores integrados planos sobre tecnologías de silicio - Pino Suárez, Francisco Javier del; Sendra Sendra, José Ramón; Hernández Ballester, Antonio; González Pérez, Benito; García García, Javier; Lalchand Khemchandani, Sunil; Núñez Ordóñez, Antonio
[ES] Las tecnologías de fabricación de circuitos integrados basadas en Silicio no han sido muy utilizadas en aplicaciones analógicas a frecuencias milimétricas, sin embargo son la alternativa para disminuir los costes. Las prestaciones de estos circuitos integrados son muy dependientes de la calidad de los elementos de circuito utilizados. Están disponibles transistores cuyas frecuencias de corte alcanzan los 60 gigahertzios., así como resistencias y capacitares capaces de operar en intervalos de frecuencia de unos giga-hertzios, sin embargo no ocurre así con los inductores. En este artículo se expone un análisis práctico de los aspectos fundamentales relacionados con el funcionamiento de...

9. Design of High Speed Based On Parallel Prefix Adders Using In FPGA - B Pullarao; J. Praveen Kumar
The binary adder is the critical element in most digital circuit designs including digital signal processors (DSP) and microprocessor data path units. As such, extensive research continues to be focused on improving the power-delay performance of the adder. In VLSI implementations, parallel-prefix adders(also known as carry-tree adders) are known to have the best performance. However,this performance advantage does not translate directly into FPGA implementations due to constraints on logic block configurations and routing overhead. This paper investigates three types of carry-tree adders (the Kogge-Stone, sparse Kogge-Stone, and spanning tree adder) and compares them to the simple Ripple Carry Adder (RCA)....

10. Dedicating Finite Volume Method to Electromagnetic Plasma Modeling: Circuit Breaker Application - Loïc Rondot; Vincent Mazauric; Yves Delannoy; Gerard Meunier
For several applications including strong hydrodynamics constraints (like in a circuit breaker), Finite Element solvers are not suitable for fluid dynamical modeling. For these applications, the coupling between the Computational Fluid Dynamics and the electromagnetism modeling is not easy. In this context, a magnetodynamic formulation is developed using the Finite Volume Method to address specific issues in multiphysics involved in circuit breaker modeling. The principles of Finite Volume Method, their using for the electromagnetism modeling, and multiphysics coupling method are described. Problems are expressed within current based T{T0 { formulation which differs drastically from other developments given in the context...

11. Author manuscript, published in "EMC Zurich, Zurich: Suisse (2009)" MoM and PEEC Method to Reach a Complete Equivalent Circuit of a Static Converter - Vincent Ardon; Jérémie Aimé; Olivier Chadebec; Edith Clavel; Enrico Vialardi
Abstract—This paper presents an application of the Method of Moments (MoM), to compute parasitic capacitances of a power electronics layout. By coupling these capacitances to a resistive and inductive equivalent circuit obtained thanks to Partial Element Equivalent Circuit (PEEC) method, a complete electrical equivalent circuit made of lumped elements is obtained. Its simulation by means of a SPICE-like tool enables the evaluation of the EMC efficiency of a power electronics structure. This method is applied to a boost converter and the results obtained by numerical simulation (MoM and finite element method – FEM) are compared to measurements. Finally, radiated EMC...

12. 2Laboratoire de Mécanique et de Modélisation des Systèmes Physiques - Désiré Ndjanfang; Patrick Marquié; Timoléon C. Kofané
Abstract—A nonlinear electrical transmission line with an intersite circuit element acting as a nonlinear resistance is introduced and investigated. In the continuum limit, the dynamics of localized signals is described by a nonlinear evolution equation belonging to the family of nonlinear diÆusive Burgers ’ equations. This equation admits compact pulse solutions and shares some symmetry properties with the Rosenau-Hyman K(2, 2) equation. An exact discrete compactlysupported signal voltage is found for the network and the dissipative eÆects on the pulse motion analytically studied. Numerical simulations confirm the validity of analytical results and the robustness of these compact pulse signals which...

13. TECHNOLOGY Floating-Gate Gate MOSFET Based Tunable Voltage Differencing Transconductance Amplifier and Its Application to Biquad Filters - Ziad Alsibai
Active circuit element tunable VDTA (Voltage Differencing Transconductance Amplifier) based on floating-gate gate MOSFETs is proposed in this paper. The mentioned VDTA is brought as the convenient element for current mode signal processing, which might be very suitable for variety of applications such as biquad filters since the circuit has the advantage of being tunable. VDTA is supposed for usage mostly in current mode circuits but it is also good choice in case of voltage mode and/or hybrid (voltage (voltage-current) current) circuits as well. This active circuit element is a type of analog block consists of two multiple-output output operational...

14. Memristor-The Missing Circuit Element - Leon Chua; Senior Member Ieee
Abstract-A new two-terminal circuit element-called the memrirtorcharacterized by a relationship between the charge q(t) s St % i(7J d7 and the flux-linkage (p(t) = J-‘-m vfrj d T is introduced os the fourth boric circuit element. An electromagnetic field interpretation of this relationship in terms of a quasi-static expansion of Maxwell’s equations is presented. Many circuit~theoretic properties of memdstorr are derived. It is shown that this element exhibiis some peculiar behavior different from that exhibited by resistors, inductors, or capacitors. These properties lead to a number of unique applications which cannot be realized with RLC net-works alone. Although a physical...

15. From Partial Element Equivalent Circuit (PEEC) to muphyPEEC for Solving Coupled Multiphysics Problems - Vjosa Shatri; Ruzhdi Sefa; Lavdim Kurtaj; Avni Skeja
A tool for unified simultaneous simulation of multiphysics problems based on Partial Element Equivalent Circuit (PEEC) method is presented. Extension of PEEC method with thermal and mechanical domains is based on circuit interpretation of Finite Difference (FD) and Finite Element Method (FEM) equations. Equations in FEM case are derived by Galerkin's residual method with basis functions of order zero or one. All steps of the process, from geometry description to netlist generation, are done with multiphysics PEEC (muphyPEEC) Toolbox for MATLAB. Solution of the problem is done with LTspice, where time- and frequency-domain simulations can be done. To demonstrate the...

16. Channel characterization and signal propagation studies for wireless galvanic coupled body sensors - Simon Cabrera, Ferran
[ANGLES`] New medical procedures involving continuous patient monitoring through human body sensors are becoming commonplace with micro-scale implanted sensors transferring information to on-surface macro-scale sensors for further data retrieval and analysis. Traditional forms of radio frequency-based wireless communication find limited use in such scenarios owing the limited penetration of electromagnetic waves through human tissue, and the need for frequent battery replacements. Instead, we propose a radically different form of wireless communication in this paper that involves galvanic coupling using extremely low energy electrical signals. The main contributions in this paper are: (i) developing a theoretical model suite to estimate the...

17. Circuit Proposition for Copying the Value of a Resistor into a Memristive Device Supported by HSPICE Simulation 1 - Farshad Merrikh-bayat; Nafiseh Mirebrahimi; Farnood Merrikh-bayat
Memristor is the fourth fundamental passive circuit element with potential applications in development of analog memories, artificial brains (with the capacity of hardware training) and neuro-science. In most of these applications the memristance of the device should be set to the desired value, which is currently performed by trial and error. The aim of this paper is to propose a circuit for copying the value of a given resistor into a memristive device. HSPICE simulations are also presented to confirm the efficiency of the proposed circuit.

18. Wide Frequency Range Lumped Element Equivalent Circuit for HF Planar Transformer
Abstract- Lumped element equivalent circuits that accurately represent the electrical behavior of H.F. n-winding transformers are now available. These circuits suit for time domain simulation but evaluation of their parameters relies on measurements. In order to avoid prototype manufacturing, engineers need to deduce same parameters from geometrical and physical data and, to carry out optimization, they prefer analytical approach to fem one. This paper shows how to do this for planar transformers which have simple geometry. Comparison of results with experimental data is given and analyzed. I.

19. Theory, Design and Applications — Part 1 - Chris Trask
Here is a thorough treatmission line transment of the operation and formers (TLTs, also practical design of low-loss, known as equal delay wide bandwidth transmis- transformers) has been a sion line transformers distinct element of RF circuit design since at least 1944, when Guanella disclosed an impedance transformer of novel design which consisted of a pair of interconnected transmission lines [1, 2]. TLTs have been found to possess far wider bandwidth and much greater transmission efficiencies by arranging the windings of the TLT to have uniform transmission line properties. In general, these devices are widely used for matching networks for...

20. The
smarter way to energy efficiency GreenChip Lighting Solutions Selection GuideThe smarter way to energy efficiency Aimed at improving energy efficiency and reducing carbon emissions, NXP’s GreenChip ICs enable you to build cost-effective, high-efficiency power and lighting solutions. Suitable for any device that draws AC power, GreenChip products feature smart power designs that deliver many extra benefits – from minimal standby power to enabling wirelessly activated lighting networks. With electronic devices governed by tough sets of EnergyStar and other utility industry regulations, it’s essential your products meet the latest power efficiency standards in active and standby (unplugged) power conditions. Our GreenChip...

Página de resultados: