SPICE Oriented Steady-State Analysis of Large Scale Circuits (Special Section on Nonlinear Theory and its Applications)

概要

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In this paper, we propose a novel SPICE oriented steady-state analysis of nonlinear circuits based on the circuit partition technique. Namely, a given circuit is partitioned into the linear and nonlinear subnetworks by the application of the substitution theorem. Each subnetwork is solved using SPICE simulator by the different techniques of AC analysis and transient analysis, respectively, whose steady-state response is found by an iteration method. The novel points of our algorithm are as follows: Once the linear subnetworks are solved by AC analysis, each subnetwork is replaced by a simple equivalent RL or RC circuit at each frequency component. On the other hand, the response of nonlinear subnetworks are solved by transient analysis. If we assume that the sensitivity circuit is approximated at the DC operational point, the variation value will be also calculated from a simple RL or RC circuit. Thus,our method is very simple and can be also applied to large scale circuits, efficiently. To improve the convergence, we introduce a compensation technique which is usefully applied to stiff circuits containing components such as diodes and transistors.
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1996-10-25