A symbolic simulator for analog circuits

13 January 2003

conference paper
Published by Institute of Electrical and Electronics Engineers (IEEE)

p. 204-205
https://doi.org/10.1109/isscc.1989.48261

Abstract

A symbolic simulator, called ISSAC (interactive symbolic analysis of analog circuits), is described. It derives all AC characteristics for analog integrated circuits, both continuous-time and switched-capacitor, CMOS and bipolar. The program provides the designer with insight into the circuit behavior by allowing symbolic calculation of transfer functions, common-mode rejection ratio, power-supply rejection ratio, impedances, and noise. The program is based on a symbolic Equation solution that exploits sparse matrix techniques, followed by an heuristic approximation. It is written in Common LISP. The input is a file in SPICE or SWAP format. The output is a rational form in the symbolic circuit parameters and the complex frequency variables s or z. All filter elements are treated as symbolic parameters; the op amps are considered to be ideal. The symbolic filter function is obtained in 0.156 CPU seconds on a 15 MIPS (million instructions per second) LISP machine. ISAAC has been used extensively for the analysis of op amps, active filters, and switched-capacitor circuits.> Author(s) Sansen, W. Katholieke Univ. Leuven, Heverlee, Belgium Glelen, G. ; Walscharts, H.

Keywords

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