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Design Automation Conference

作者： B.S. Carlson C.Y.R. Chen The Advanced IC Design of and Simulation Laboratory and the Department of Electrical Engineering State University of New York Stony Brook NY USA Department of Electrical and Computer Engineering Syracuse University Syracuse NY USA

A method which uses transistor reordering for the performance enhancement of CMOS circuits is presented. The proposed technique achieves significant reduction in propagation delays with little effect on layout area. The technique can be coupled with transistor sizing to achieve unbounded improvement in circuit delay, and it can be used to decrease dynamic power dissipation. In particular, excellent results have been achieved when the method is applied to data path circuits.

关键词： Very large scale integration Propagation delay Transistors Switches Switching circuits Logic gates CMOS logic circuits Logic devices Registers Delay effects

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Hierarchical modeling for discrete event simulation (PANEL) 93

Hierarchical modeling for discrete event simulation (PANEL)

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25th Conference on Winter simulation, WSC 1993

作者： Sargent, Robert G. Mize, Joe H. Withers, David H. Zeigler, Bernard P. Simulation Research Group 439 Link Hall Syracuse University SyracuseNY13244 United States School of Industrial Engineering and Management 322 Engineering North Oklahoma State University StillwaterOK74078 United States Mead Data Central P.O. Box 933 DaytonOH45401 United States Department of Electrical and Computer Engineering University of Arizona TucsonAZ85721 United States

This panel session is to discuss the issues and current research in hierarchical modeling for discrete event simulation. Three academic researchers are to briefly describe their research in hierarchical modeling and t... 详细信息

ISBN: (纸本)078031381X

关键词： Discrete event simulation

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Critical performance path analysis, and efficient code generation issues, for the Seamless architecture

Critical performance path analysis, and efficient code gener...

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International Symposium on Parallel Processing

作者： D.L. Bright S.A. Fineberg B.H. Pease M.L. Roderick S. Sundaram T.L. Casavant Parallel Processing Laboratory Department of Electrical and Computer Engineering University of Iowa Iowa IA USA Numerical Aerodynamic Simulation NASA Ames Research Center CA USA

An analytical study of potential pathological performance areas of the Seamless architecture is presented. Seamless is a latency-tolerant, distributed memory, multiprocessor architecture. A key component of the philosophy of Seamless, however, is the use of standard, commodity components for a large part of the system. A discussion of the unavoidable implementation compromises imposed by this decision is presented, followed by a summary of some optimistic performance studies. Then an analytical study that parameterizes the predicts the worst-case impact of using standard components is provided. Finally, it is shown that these bottlenecks are manageable via careful generation of target machine code so that the optimistic performance studies become realistic expectations for a range of program behaviors and granularities.< >

关键词： Performance analysis computer architecture Hardware Reduced instruction set computing Workstations Costs Aerodynamics Computational modeling Analytical models Numerical simulation

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Multilevel multidimensional quadratic modeling for yield-driven electromagnetic optimization

Multilevel multidimensional quadratic modeling for yield-dri...

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Microwave, MTT-S International Symposium

作者： J.W. Bandler R.M. Biernacki S.H. Chen S. Ye P.A. Grobelny Optimization Systems Associates Inc. Dundas ONT Canada Simulation Optimization Systems Research Laboratory and Department of Electrical and Computer Engineering McMaster University Hamilton Canada

Powerful multilevel multidimensional quadratic modeling has been developed for efficient yield-driven design. This approach makes it possible to perform direct yield optimization of circuits with microstrip structures simulated by an electromagnetic simulator. This approach is particularly useful for circuits containing complex subcircuits or components whose simulation requires significant computational effort. The efficiency and accuracy of this technique are demonstrated by yield optimization of a small-signal amplifier.< >

关键词： Multidimensional systems Electromagnetic modeling Circuit simulation Computational modeling Design optimization Power system modeling Yield estimation Random number generation computer simulation Laboratories

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NUMERICAL-simulation OF CURRENT-VOLTAGE CHARACTERISTICS OF SILICON PHOTOCONDUCTIVE CIRCUIT ELEMENTS

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INTERNATIONAL JOURNAL OF NUMERICAL MODELLING-ELECTRONIC NETWORKS DEVICES AND FIELDS 1993年第3期6卷 221-231页

作者： SHAKOURI, H LIOU, JJ Electrical and Computer Engineering Department University of Central Florida Orlando FL 32816 U.S.A. Juin J. Liou received the B.S. (Honours) M.S. and Ph.D. degrees in electrical engineering from the Univeristy of Florida Gainesville in 1982 1983 and 1987 respectively. HIs doctoral research with Dr F. A. Lindholm involved the characterization of the space-charge region of semiconductor junction devices. From 1985 to 1986 he was an Instructor in the Department of Electrical Engineering at the University of Florida. In 1987 he joined the Department of Electrical Engineering at the University of Central Florida Orlando where he is now an Associate Professor. His current research interests are in CAD tool development circuit simulation and modelling semiconductor devices including homojunction bipolar transistors heterojunction bipolar transistors junction field-effect transisstors solar cells and photoconductivity siwtching devices. Dr Liou has published more than 100 technical papers in refreed journals and international and national conference proceedings. He has served as a technical reviewer for several journals and conferences as well as an associate editor for theSimulationjournal under the area of VLSI and circuit simulation. His honours and awards include: Outstanding Young Men of American in 1987 Distinguished Researcher Award Electrical Engineering Department University of Central Florida in 1988 1989 and 1991 Distinguished Researcher Award College of Engineering University of Centeral Florida in 1991 Engineer of the Year IEEE Orlando Section 1992 Eminent Engineer Tau Beta Pi 1992. In the summer of 1992 Dr Liou worked at Solid State Laboratory Wright-Patterson Air Force Base Ohio as a Summer Research Faculty sponsored by the Air Force Office of Scientific Research.

Photoconductive circuit elements (PCEs) are suitable for switching applications: they can be turned on and off rapidly, they can conduct a large current in the 'on' state when applying a laser or other optical excitation containing high energy photons exceeding the silicon band gap energy, they have a large resistance in the 'off' state when the light is off, and they can be fabricated using a simple process. We report the steady-state characteristics of PCEs simulated from a two-dimensional simulator called PISCES-2B. The effects of the conducting channel length, the resistivity of the intrinsic silicon, and the type of contact region on the performance of the PCE will be investigated and discussed. Based on the simulation results, optimal PCE device make-ups will also be suggested.

关键词： Photoconducting materials

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Minimax microstrip filter design using direct EM field simulation

Minimax microstrip filter design using direct EM field simul...

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Microwave, MTT-S International Symposium

作者： J.W. Bandler S. Ye R.M. Biernacki S.H. Chen D.G. Swanson Simulation Optimization Systems Research Laboratory Department of Electrical and Computer Engineering McMaster University Hamilton Canada Optimization Systems Associates Inc. Dundas ONT Canada Watkins-Johnson Company Palo Alto CA USA

A comprehensive approach to microwave filter design which exploits accurate filed simulations driven directly by a gradient-based minimax optimizer is presented. Challenges of efficiency, discretization of geometrical dimensions, and continuity of optimization variables are reconciled by a three-stage attack: (1) efficient response interpolation; (2) smooth gradient estimation; and (3) dynamic database updating. The design optimization of two microstrip filters illustrates the technique described.< >

关键词： Minimax techniques Microstrip filters Design optimization Circuit simulation Computational modeling Microwave filters Frequency Interpolation Insertion loss Passive circuits

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Robustizing circuit optimization using Huber functions

Robustizing circuit optimization using Huber functions

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Microwave, MTT-S International Symposium

作者： J.W. Bandler S.H. Chen R.M. Biernacki K. Madsen L. Gao H. Yu Optimization Syst. Associates Inc. Dundas Ont. Canada Simulation Optimization Systems Research Laboratory Department of Electrical and Computer Engineering McMaster University Hamilton Canada Institute of Numerical Analysis Technical University of Denmark Lyngby Denmark Department of Mathematics and Institute of Mathematics Peking University Beijing China

The authors introduce a novel approach to 'robustizing' microwave circuit optimization using Huber functions, both two-sided and one-sided. They compare Huber optimization with l/sub 1/, l/sub 2/, and minimax methods in the presence of faults, large and small measurement errors, bad starting points, and statistical uncertainties. They demonstrate FET statistical modeling, multiplexer optimization, analog fault location, and data fitting. They extend the Huber concept by introducing a 'one-sided' Huber function for large-scale optimization. For large-scale problems, the designer often attempts, by intuition, a preliminary optimization by selecting a small number of dominant variables. It is demonstrated, through multiplexer optimization, that the one-sided Huber function can be more effective and efficient than minimax in overcoming a bad starting point.< >

关键词： Robustness Circuit optimization Minimax techniques Multiplexing Large-scale systems Optimization methods Circuit faults Measurement errors Microwave FETs Fault location

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Development and integration of an equation-solving program for engineering thermodynamics courses

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computer Applications in engineering Education 1993年第3期1卷 265-265页

作者： Klein, S.A. Mechanical Engineering Department University of Wisconsin-Madison 53706 Dr. S. A. Klein:is a professor of Mechanical Engineering at University of Wisconsin-Madison. His engineering degrees (BS University of Illinois-Chicago MS PhD University of Wisconsin-Madison) were obtained in Chemical Engineering. Professor Klein is a member of the Solar Energy Laboratory at Wisconsin. He is the developer of the F-Chart method for sizing solar heating systems and the TRNSYS simulation program which is widely used in simulations of solar processes. Currently Professor Klein is involved in research on solar energy system performance absorption power cycles finite-time thermodynamics applications adsorption processes for air conditioning and air quality control and alternative refrigerants and systems for refrigeration and air conditioning applications. Professor Klein is also involved in the development of engineering computer tools for both instruction and research. In addition to the EES program described in this paper he is the primary author of the thermodynamics instructional program CP/Thermo and the finite element program FEHT.

Thermodynamics problems can be separated into conceptual and mathematical parts. The conceptual part consists of the problem formulation and analysis. The mathematical part seeks to obtain an answer to a problem by solving the equations identified in the analysis. The mathematical part can be complex and time-consuming and often directs the students' focus away from the concepts. An equation solving program called engineering Equation Solver (EES) was developed to reduce the time and effort required by students to solve the mathematical part of thermodynamics problems. EES differs from existing equation solving programs in that it is designed for use by students and it includes an extensive library of built-in functions for thermodynamic and transport properties of fluids. Thermodynamic and transport property data needed for solving engineering problems (eg, steam tables, refrigerant properties, psychrometric and combustion gas data) are built into the program. By eliminating table lookups and algebra, EES allows students to concentrate on engineering fundamentals, as well as to do more complex design problems.

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Steady‐state modelling of a uniform pulse‐width modulated single‐phase AC‐to‐DC converter‐fed DC motor drive

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European Transactions on Electrical Power 1993年第5期3卷 379-386页

作者： Hamed, S.A. Dr. Sadeq A. Hamed (1957) received his B.Sc. degree in Electrical Power Engineering from Damascus University Syria in 1980. From 1980 to 1982 he has been with the Department of Electrical Engineering at the University of Jordan Ammad/Jordan. He obtained the M.Sc. degree in Power Electronics and Systems and the PhD degree in Power Electronics from the University of Manchester Institute of Science and Technology (UMIST) Manchester/GB in 1983 and 1986 respectively. In 1986 he joined the Department of Electrical Engineering. Jordan University as an Assistant Professor. In 1991 became an Associate Professor at the same department. His research activities include modelling and simulation of AC/DC drive systems pulse-width modulation control of motor implementation of computer-controlled drive systems energy saving in the electrical drive industry. (Jordan University Department of Electrical Engineering Amman/Jordan T + 96 26/843555 - 28 13 Fax + 9626/8485 58)

With the increasing availability of power transistor switches, PWM controlled rectifiers can efficiently and economically be employed in low and medium power applications of DC drive systems. In this paper, steady‐state modelling and solution of a uniform pulse‐width modulated single‐phase AC‐to‐DC converter‐fed DC motor drive is accomplished. The developed model is presented in a generalized form that is applicable irrespective of the number of pulses per supply half‐cycle. Measured and predicted parameters are shown to be very close and the model is proved to be efficient and accurate. Both continuous and discontinuous modes of operation are covered, and critical operating conditions at which the system moves from one mode to the other are thoroughly investigated. The effects of the armature inductance‐to‐resistance ratio and the chopping frequency on these critical conditions, load and line harmonics, and on the ripple contents of the armature current are also thoroughly investigated. Copyright © 1993 John Wiley & Sons, Ltd.

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TLM MODELING USING AN SIMD computer

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INTERNATIONAL JOURNAL OF NUMERICAL MODELLING-ELECTRONIC NETWORKS DEVICES AND FIELDS 1993年第4期6卷 299-304页

作者： TAN, CC FUSCO, VF The Queen's University of Belfast Department of Electrical & Electronic Engineering Ashby Building Stranmillis Road Belfast BT9 5AH U.K. Chun Chia Tan obtained a first-class honours degree from The Queen's University of Belfast. He was awarded an IEE prize for best final-year project. His current research interests include the modelling of electromagnetic fields using parallel processing techniques. At present Mr Tan is working as an electrical engineer in Malaysia. Vincent F. Fusco was educated at The Queen's University of Belfast where he obtained the degree of Ph.D. He has worked as a research engineer on short-range radar and radio telementry systems. Currently he is a Reader in Microwave Commnications in the School of Electrical Engineering and Computer Science The Queen's Univeristy of Belfast. His current research interests include non-linear microwave circuit simulation and concurrent programming techniques for electromagnetic field problems. He has acted as consultant to a number of major companies and has published numerous research papers in these areas. He is author of the bookMicrowave Circuits Analysis and Computer Aided Design(Prentice Hall 1987). Dr Fusco is a Chartered Electrical Engineer and a Member of the Institute of Electrical Engineers.

A major limitation of the transmission-line matrix (TLM) method used to solve Maxwell's equations is the long computation time required. The TLM scattering calculations involved can, however, be viewed as parallel in nature. This paper describes an effort to reduce computational time by using an SIMD, DAP multiprocessor computer employed to solve a two-dimensional TLM electromagnetic field formulation. A parallel algorithm based on the TLM scattering algorithm is designed and implemented using FORTRAN-PLUS Enhanced on an AMT DAP 510 machine. Here the connectivity of the DAP is exploited to simulate the intrinsic scattering behaviour on which the TLM algorithm relies. The results show that parallel processing on an SIMD machine such as the DAP is advantageous, especially for higher-order mesh sizes.

关键词： Electric lines

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