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Custom Integrated Circuits Conference (CICC)

作者： N. Verghese D.J. Allstot S. Masui SRC-CMU Research Center for Computer Aided Design Department of Electrical and Computer Engineering Carnegie Mellon University Pittsburgh PA USA Semiconductor Basic Technology Research Laboratory Nippon Steel Corporation Kanagawa Japan

Asymptotic waveform evaluation (AWE) techniques have been used to develop macromodels that allow accurate and efficient simulation of substrate-related parasitic electrical coupling effects using a modified version of SPICE3. While achieving comparable accuracy to a mixed device-circuit simulator (PISCES IIB), simulation time is reduced by several orders of magnitude. The macromodeling technique can be extended to simulate noise coupling in a VLSI chip, in contrast to conventional device-circuit simulators.

关键词： Substrates Coupling circuits Circuit simulation Crosstalk Semiconductor device noise Voltage Circuit noise Maxwell equations computational modeling CMOS technology

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Macromodeling of the AC characteristics of CMOS op-amps 93

Macromodeling of the AC characteristics of CMOS op-amps

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IEEE International Conference on computer-aided design

作者： P. Mandal V. Visvanathan Electrical Communication Engineering Department Indian Institute of Science Bangalore Karnataka India Computer-Aided Design Laboratory Supercomputer Education and Research Centre Indian Institute of Science Bangalore Karnataka India

ISBN: (纸本)9780818644900

An analytical-knowledge-based statistical method is developed to derive macromodels for the highly nonlinear AC response functions of CMOS op-amp circuits. Simple circuit analysis is used to motivate the use of logarithmic transformations. By this transformation, linear models are fitted over a large domain of the independent variables (typically, transistor widths) with very few circuit simulations. From circuit analysis it is deduced that poles and zeroes are appropriate for empirical modeling instead of directly modeling the response functions like unity gain frequency or phase margin. We have demonstrated the usefulness of the proposed method by using it to model the transfer function of a two-stage compensated CMOS op-amp circuit. The model is compared with SPICE3 simulations and shown to have excellent predictive capability, with a speed-up of more than 500.

关键词： Operational amplifiers design optimization Semiconductor device modeling Circuit simulation Polynomials Statistical analysis Circuit analysis Predictive models Very large scale integration Analog circuits

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A Decision Support Tool for the Railway Industry Based on computer Graphics and Intuitive Modelling Techniques

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computer‐aided Civil and Infrastructure engineering 1993年第2期8卷 105-118页

作者： Tsiflakos, K. Owen, D.B. Computer Aided Design Research Croup Mineral Resources Engineering Department Imperial College of Science Technology and Medicine London SW7 2BP United Kingdom

Abstract: The application of many operational research techniques employed by the railway industry requires as input a data model representing the geometrical, structural and operational characteristics of the railway network in question. However, constructing network models with the conventional methods requires a considerable amount of manual work that involves handling large amounts of both qualitative and predominantly, quantitative information. This paper presents an alternative approach for prototyping, constructing and querying railway models, incorporating interactive computer graphics. The presented approach allows the model builder to carry out the modelling task more quickly and accurately. After reviewing the transportation model building trends of the last decades, the authors present the characteristics of the proposed system, demonstrate its main functions and assess its impact on the efficiency of the modelling task. Copyright © 1993, Wiley Blackwell. All rights reserved

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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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CONCURRENT BOUNDARY-ELEMENT computation

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INTERNATIONAL JOURNAL OF NUMERICAL MODELLING-ELECTRONIC NETWORKS DEVICES AND FIELDS 1993年第2期6卷 83-98页

作者： MCDOWALL, DS LEE, TW FUSCO, VF Microwave Research Group Department of Electrical and Electronic Engineering The Queen's University of Belfast Ashby Building Stranmillis Road Belfast BT9 5AH Northern Ireland U.K. D. Stewart McDowall was born in Dublin epublic of Ireland in 1967. He received the M. Eng. degree in Electrical and Electronic Engineering from the Queen's University of Belfast in 1990. In the same year he was presented with a Distinction Award from the Department of Education of Northern Ireland and he is currently pursuing his Ph.D. in the Microwave Research Group at Q.U.B. His principal research area is the electromagnetic field mapping of microwave systems using concurrient programming. He is an Associate Member of the Institute of Electrical Engineers. Lee Thaim Wee was awarded the degree of B. Eng. in Electronics from the Queen's University of Belfast in July 1991. He is currently serving in the Malaysian Armed Forces. Vincent F. Fusco was educated at the Queen's Univeristy of Belfast where he obtained the degree of Ph.D. in 1982. He has worked as a research engineer on short-range radar and radio telementry systems. Currently he is a reader in Microwave Communications 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 with particular emphasis on EMC applications. He has published numerous research papers in these areas. He is the 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 boundary element method (BEM) for the solution of electrical potential problems is the long computational time required. However, a large portion of the calculations involved can be viewed as being parallel in nature and can therefore be computed concurrently. This paper makes an effort to increase the efficiency of the BEM process using transputer-based multiprocessor computing techniques. The algorithms developed may equally well be applied to any multiprocessor system. The application selected to demonstrate the technique is the solution of an electrostatic problem governed by a two-dimensional Laplace equation. A parallel algorithm for problem setup and field extraction using BEM is designed and implemented on a transputer array. Special attention is directed to the utilization of the parallel processors to achieve maximum efficiency. The analysis in this work concentrates on the communication strategies for passing data between processors as well as a consideration of the workload attributed to each processor. The parallel algorithms were implemented using 3L Parallel Fortran;however, the choice of topology for the overall BEM implementation was limited by the fact that certain parts of the algorithm could only utilize a pipeline configuration of processors. Comprehensive results for the parallel BEM algorithm are given and they are encouraging, indicating that parallel processing has much to offer when applied to the boundary element method.

关键词： Boundary element method

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SHIPBOARD DAMAGED STABILITY ASSESSMENT - THE FLOODING CASUALTY CONTROL SOFTWARE

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NAVAL ENGINEERS JOURNAL 1993年第3期105卷 152-166页

作者： ZAHN, PB ROSBOROUGH, J CARLSTROM, R Peter B. Zahn:is a section chief in the Naval Architecture Department at Advanced Marine Enterprises. He is responsible for software development and special trials support. He has led the Flooding Casualty Control Software (FCCS) development effort since joining AME in 1989. He is also responsible for the material handling strikedown and stowage (MHS&S) software development program as well as special trials support for the ACVLAP and T-AGOS 19 programs. Prior to joining AME Mr. Zahn spent nine years with various companies of the ARCTEC Group. His experience includes field trials in venues from the Caribbean to the Bering Sea as well as model tests and engineering design and development efforts. Mr. Zahn received his B.S. in naval architecture and marine engineering from Webb Institute in 1980 and has published various papers on pollution prevention offshore systems and icebreaker design and performance. He is a member of ASNE and SNAME. John Rosborough:has been a naval architect for the Naval Sea Systems Command (NavSea) for the past 15 years. He is currently assigned to the Hydrodynamics Division with responsibility for aircraft carrier stability evaluations and as a task leader for computer-aided ship design development. In the Stability Division he was previously responsible for stability analyses on various amphibious ships SWATHs and foreign ships. He manages the upgrade and augmentation of SHCP at NavSea and is the Navy's technical point of contact for evaluating shipboard stability software and transitioning technology to the fleet. Mr. Rosborough received his B.S. in naval architecture and marine engineering from the University of Michigan in 1977. He is a member of USNI and the Association of Scientists and Engineers at NavSea. Richard Carlstrom:is a naval architect with Advanced Marine Enterprises. He has been responsible for software development in support of a variety of major programs including FCCS and SHCP and is a specialist in stability evaluations for complex ships such as CVs CVNs

The Flooding Casualty Control Software (FCCS) was developed under the auspices of the Naval Sea Systems Command (NavSea) and is currently being deployed on a variety of ships in the neets of both the U.S. Navy and the U.S. Coast Guard. The primary objective of FCCS is to enable damage control personnel to identify critical stability conditions, especially when related to the loss of reserve buoyancy due to battle damage and the destabilizing effects of large quantities of firefighting water, in a timely manner. FCCS was initially deploved in 1990. It utilizes the standard algorithms of the Ship Hull Characteristics Program (SHCP). The user interface was designed to allow quick familiarity for shipboard users, primarily the damage control assistant (DCA) and his staff. Intact stability evaluations include the effects of topside icing, high winds, personnel crowding, heavy lifts over the side, high speed turns, and towing. FCCS also supports ballasting analysis for amphibious ships as well as providing bottom reaction and beached stability data for grounding incidents. Bv providing a tool for the ''fuel king'' and DCA to generate the required daily updates on the current ship load and liquids status, FCCS is assured of an accurate baseline in the event of damage. The design allows the evaluation of the ultimate ship stability status for a damage event using simple compartmentation and flooding status inputs. Evaluation of the adequacy of resulting stabilitv, as well as identification of such critical stability parameters as off center loading, margin line immersion, and negative GM, are accomplished by the program. Guidance is provided for the user to initiate appropriate flooding related damage control activities. Initially fitted on USS Oliver Hazard Perry Class frigates, FCCS databases have been for the USCG Hamilton class high endurance cutters, USS Arleigh Burke class Aegis destroyers, and a variety of other U.S. Navy and U.S. Coast Guard ship classes. The progra

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A new method for reduction of current and voltage harmonic distortion in power systems

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European Transactions on Electrical Power 1993年第1期3卷 85-89页

作者： Mikolajuk, K. Tobola, A. Prof. Kazimierz Mikolajuk (1941) is head of the Institute of the Theory of Electrical Engineering and Electrical Measurements Warsaw University of Technology Poland. He received the M. Sc. Ph. D. and D. Sc. degrees from Warsaw University of Technology in 1963 1972 and 1977 respectively all in electrical engineering. His current research interests include the theory of non-linear circuits synthesis of power electronic circuits and harmonic power compensators. (Warsaw University of Technology Institute of Electrical Theory and Measurements Koszykowa 75 PL-00-66 1 Warsawl Poland T +482/628 45 68 Fax + 482/29 29 62) Dipl.-Ing. Andrzej Tobola (1956) received his M. Sc. degree from Warsaw University of Technology Poland in 1980. He is currently working for the Ph. D. degree. Since 1984 he is working as assistant at the department of Electrical Engineering Warsaw University of Technology. His scientific works are concentrating around computer aided design of power electronic circuits and numerical methods in electrical engineering. (Warsaw University of Technology Institute of Electrical Theory and Measurements Koszykowa 75 PL-00-661 Warsaw/Poland T +4822/400071-263 Fax +48 22/29 29 62)

The paper shows that it is possible to design such a switched 1 ‐port which ‐ excited by a sinusoidal voltage ‐draws desired current harmonics. The circuit switched twice within a period can generate odd current harmonics and the circuit switched once within a period generates even harmonics. This new kind of compensator has advantages of active filters such as good compensation characteristics. On the other hand it is easier to realize a large VA compensator based on the presented idea than to realize a high switching frequency static power compensator. Most established active and hybrid filters are based on a load current measurement. The compensator presented in the paper can be used to eliminate current distortion as well as voltage distortion. The two‐step optimization with the use of the harmonic voltage measurement allows to eliminate harmonic voltage. The results of numerical simulation and experimental results are presented. Copyright © 1993 John Wiley & Sons, Ltd.

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Measurements of power and current components in unbalanced and distorted three‐phase systems

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European Transactions on Electrical Power 1993年第1期3卷 75-83页

作者： Andria, G. Salvatore, L. Savino, M. Trotta, A. Dr. Gregorio Andria (1956) AEI received the M. S. degree in Electrical Engineering from the State University of Bari/Italy in 1981 and the Ph. D. degree in Electrical Engineering in 1987 from the same University. From 1981 to 1983 he was working in the Electrotechnics and Electronics Department of the University of Bari as a member of the research team on electrical measurements. From 1984 to 1986 he was a Doctoral Fellow and currently he is a researcher in the same department. His research interests are in the fields of electrical and electronic measurements on components and systems including digital measurements for the analysis of electrical quantities in non-sinusoidal systems and the design of integrated optical sensors for measurement and control of non-electrical physical quantities. (Department of Electrotechnics and Electronics Faculty of Engineering polytechnic of Bovia E. Orabona 4 1-70125 Bari. Italy T +3980/242266 Fax + 3980/242410) Prof. Luigi Salvatore (1945) AEI received the degree in electrical engineering from the University of Bari/Italy in 1970. Since 1976 he has worked in the Electrotechnical and Electronic Department of the same University as a member of the research team on electrical machines. From 1983 to 1987 he was a researcher of electrical machines in the same department. Since 1987 he has been an Associate Professor of electrical machines at the University of Bari. At the present time his research interests include the control monitoring and diagnostics of AC drives and the areas of signal processing anddigital measurements on power electronics systems. (Department of Electrotechnics and Electronics Faculty of Engineering Polytechnic of Bari via E. Orabona 4 I-70125 Bari Italy T + 3980/242258 Fax + 3980/242410) Prof. Mario Savino (1947) AEI received the degree in Electrical Engineering from the University of Barif Italy in 1971. Since then he has been working in the Electrotechnical Institute of Bari until 1973 as researcher from 1973 to 1982 as Assistant Profe

The paper deals with the instantaneous power theory in three‐phase circuits by using the instantaneous time phasors of voltage and current. Particularly it is shown that the instantaneous components of the current time‐phasor in a rotating reference frame p‐q, oriented in such a way that the instantaneous voltage time‐phasor points to the p‐axis direction, represent the active and reactive currents. These components give rise to instantaneous real and imaginary powers, respectively. The spectral analysis of the above‐mentioned time‐phasors gives the harmonic symmetrical components of positive and negative sequence of voltage and current three‐phase systems. The line‐by‐line product of the voltage sequence spectrum by the complex conjugate of the current sequence spectrum gives the DC components of the instantaneous real and imaginary powers. The paper shows also that the instantaneous active and reactive currents are different from those defined on grounds of the Fryze's theory, which can be determined from the voltage and current sequence spectra. Copyright © 1993 John Wiley & Sons, Ltd.

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SIZING design SENSITIVITY ANALYSIS OF DYNAMIC FREQUENCY-RESPONSE OF VIBRATING STRUCTURES

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JOURNAL OF MECHANICAL design 1992年第1期114卷 166-173页

作者： CHOI, KK LEE, JH Department of Mechanical Engineering and Center for Computer Aided Design College of Engineering The University of Iowa Iowa City IA 52242

A continuum design sensitivity analysis method of dynamic frequency response of structural systems is developed using the adjoint variable and direct differentiation methods. A variational approach with a non-selfadjoint operator for complex variable is used to retain the continuum elasticity formulation throughout derivation of design sensitivity results. Sizing design variables such as thickness and cross-sectional area of structural components are considered for the design sensitivity analysis. A numerical implementation method of continuum design sensitivity analysis results is developed using postprocessing analysis data of COSMIC/NASTRAN finite element code to get the design sensitivity information of displacement and stress performance measures of the structures. The numerical method is tested using basic structural component such as a plate supported by shock absorbers and a vehicle chassis frame structure for sizing design variables. Accurate design sensitivity results are obtained even in the vicinity of resonance.

关键词： Structural elements (Construction) design sensitivity analysis Vehicles Shock absorbers Displacement design Frequency response Stress Numerical analysis Elasticity Resonance Finite element analysis

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MODELING SUBMICROMETER GAAS-MESFETS USING PISCES WITH AN APPARENT GATE-LENGTH-DEPENDENT VELOCITY-FIELD RELATION

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IEEE TRANSACTIONS ON ELECTRON DEVICES 1992年第7期39卷 1778-1780页

作者： FARDI, HZ HAYES, RE NSF Industry University Cooperative Research Center of Microwave Millimeter-Wave Computer-Aided Design (MIMI-CAD) Department of Electrical and Computer Engineering University of Colorado Boulder CO USA

An empirical velocity-field relationship, based on Monte Carlo simulation, is integrated into the PISCES drift-diffusion simulation program in order to analyze short-gate GaAs MESFET's. The current-voltage characteristics are compared with 2D Monte Carlo simulation results on a 0.2-mu-m gate length, and with measured I-V characteristics of a 0.32-mu-m gate-length GaAs MESFET. The comparison and the analysis made support the accuracy of the modified drift-diffusion model and makes it computationally efficient for simulation of short-gate devices.

关键词： Gallium arsenide MESFETs computational modeling Circuit simulation Electrons Current-voltage characteristics Analytical models Monte Carlo methods Poisson equations design automation

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