ISSN:0098-9886    

DOI:10.1002/cta.4490230402

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1995

数据来源: WILEY

摘要:

AbstractThis paper discusses the realization of an analogue module generator that forms part of a mixed analogue/digital design environment. It is able to design analogue functional modules such as like amplifiers, filters, etc., either in an automatic or in an interactive session, starting from performance specifications over topology selection, parameter optimization and simulation/verification down to lay‐out. the analogue module generator is integrated in a commercial EDA framework. Practical design results show the capabilities and efficiency of the syste

ISSN:0098-9886    

DOI:10.1002/cta.4490230403

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1995

数据来源: WILEY

摘要:

AbstractDARWIN is a synthesis tool for generating sized net lists of CMOS op amps from performance specifications and process parameters. the synthesis process starts with an initial set of randomly generated op amps. Owing to genetic operator ‘crossover’ and ‘mutation’, the population of op amps evolves to a population in which several op amps meet the required specifications. During the synthesis process the circuit topology and circuit parameters (capacitor values, bias currents and transistor lengths and widths) evolve simultaneously with the final solution. the circuit description we use in the genetic algorithm ensures that all intermediately generated circuits possess a number of qualities that are required for a correct functioning of the circuit. Synthesis experiments have shown that DARWIN is capable of synthesizing functional circuits without the need of much design kn

ISSN:0098-9886    

DOI:10.1002/cta.4490230404

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1995

数据来源: WILEY

摘要:

AbstractIn this paper a method for the steady state analysis and optimization of non‐linear autonomous circuits is described. After discretizing the linear part of the circuit, a system of non‐linear algebraic equations is obtained. the final formulation is written entirely in the discrete‐time domain, making it unnecessary to repeatedly take direct and inverse DFTs during the solution process. Furthermore, it is shown that the resulting formulation may be viewed as a generalization of the harmonic balance equations. an analytic method for computing the exact partial derivatives of the resulting equations with respect to the samples of the variables, the oscillation period and the circuit element values is described, making the proposed approach efficient for both analysis and optimization. Different globally convergent techniques for solving the non‐linear system of equations are described, with emphasis on an algorithm based on fast simulated diffusion. Selected application examples are provided to validate the proposed a

ISSN:0098-9886    

DOI:10.1002/cta.4490230405

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1995

数据来源: WILEY

摘要:

AbstractAnalogue and microwave design requires accurate and reliable simulation tools and methods to meet the design specifications. System properties are often measured in the steady state. Well‐suited algorithms for calculating the steady state can be classified into shooting methods, finite difference methods and the harmonic balance (HB) technique. Harmonic balance is a frequency domain method which approaches the problem of finding the steady state by a trigonometric polynomial. Depending on the size of the circuit and the number of Fourier coefficients of the polynomial, the resulting system of non‐linear equations can become very large. These non‐linear equations are solved by using Newton's method.The sparse linear system arising from Newton's method can be solved by direct, stationary or non‐stationary iterative solvers. Iterative methods are normally easy to parallelize or vectorize.In this paper a tool for the simulation of the steady state of electronic circuits is presented. the steady state is calculated using the harmonic balance technique. Non‐linear equations are solved by Newton's method and linear equations by preconditioned non‐stationary iterative solvers (CGS, Bi‐CGSTAB, BiCGSTAB(2), TFQMR). the run time is reduced dramatically, by up to an order

ISSN:0098-9886    

DOI:10.1002/cta.4490230406

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1995

数据来源: WILEY

摘要:

AbstractAn approximate harmonic analysis method for non‐linear circuits is introduced. the method solves the steady state, time domain representation as well as the frequency response of non‐linear circuits. It allows simulation of non‐ideal switched capacitor circuits composed of any kinds of linear components and non‐linear transistors as switches. All switches must have the same period, but they can be opened and closed at any time. the method proposed may also be applied to mixer analysis for the case of strong LO and weak RF signals. Examples are given to demonstrate that the method is efficient and sufficiently fast to be used in circuit design. the simulation results show good agreement with those obtained by harmonic balance and transient a

ISSN:0098-9886    

DOI:10.1002/cta.4490230407

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1995

数据来源: WILEY

摘要:

AbstractThis paper presents a new appoach based on the use of describing functions to obtain approximate symbolic expressions for the fundamental frequency component as well as for the second‐ and third‐order harmonics. A single soft or hard transconductance non‐linearity embedded in an arbitrary linear network is studied. Three examples are consi

ISSN:0098-9886    

DOI:10.1002/cta.4490230408

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1995

数据来源: WILEY

摘要:

AbstractThe paper presents a method of settling time minimization in switched capacitor (SC) circuits. This problem has been discussed in recent papers because of high‐frequency applications of SC networks. In comparison with the methods elaborated up to now and limited to biquads, the method presented in this paper can be used for an SC circuit containing an arbitrary number of operational amplifiers coupled together in each switching state and modelled as ideal transconductances. the fifth‐order ladder bilinear SC filter is considered for illustration of the method and SPICE simulati

ISSN:0098-9886    

DOI:10.1002/cta.4490230409

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1995

数据来源: WILEY

摘要:

AbstractThis paper describes SWANN, a programme for fast simulation of non‐linear switched analogue networks. the switches act as open and short circuits and are used to model switching diodes, transistors or thyristors. Non‐linearities of other elements such as capacitors, inductors, resistors, conductors and dependent sources, are modelled by polynomials. Possible inconsistent conditions which can appear in networks with ideal switches are correctly handled. At switching instants the values from left and right are obtained and are available for plotting. Examples show applications in communications and power electron

ISSN:0098-9886    

DOI:10.1002/cta.4490230410

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1995

数据来源: WILEY

摘要:

AbstractA technique is presented which allows efficient calculation of substrate‐coupling macromodels in integrated circuits. the technique can be used to calculate node‐to‐node resistances or impedances in substrate models. Examples of the technique applied to several test structures are pres

ISSN:0098-9886    

DOI:10.1002/cta.4490230411

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1995

数据来源: WILEY