非线性电路分析系统的设计及仿真研究

Design and Simulation of Non-linear Circuit Analysis System

针对MATLAB在解析高阶非线性电路时存在的困难以及与当前主流电路系统分析软件的不兼容性,设计了基于MATLAB平台并兼容SPICE规范的电路分析系统。研究的主要内容有:使用离散化伴随模型降维方法得到非线性器件的直接与递归线性化仿真模型,用四象限法进行非线性电路的直流计算,对时域线性多步数值积分方法的初值、步长和断点进行了优化设计。结果表明:系统保证了电路的仿真精度,大大加快了仿真速度,且降低了对工作平台的要求,弥补了MATLAB平台在高阶非线性电路仿真方面的不足。

Due to the difficulty of MATLAB in solving high - order non - linear circuit and the incompatibility of the analysis software of main circuit system at present, a circuit analysis system compatible with SPICE is designed. The main contents are ： the direct and recursion linear simulation model of non - linear device is got by using discrete concomitance model ; direct current analysis for non - linear circuit is done by using four quadrant method ; the initial value, step and breakpoint of the time - domain multi - step numerical integration method are optimized. The results show that the simulation system guarantees the accuracy, accelerates simulation speed and reduces the requirements of the working platform. It remedies the defect of high speed non - linear circuit simulation in MATLAB platform .