Spice-Oriented Distortion Analysis of Nonlinear Networks

Frequency-domain distortion analysis is very important for designing the analog integrated circuits. We propose here a new method based on the Spice-oriented harmonic balance method, where the Fourier transformations of the resistive circuits driven by a periodic input are carried out by the Fourier transfer circuit model. The circuit is composed of the analog behavior models(ABM) of Spice, which can be applied to any kind of nonlinear circuits containing the exponential and/or piecewise linear characteristics. Furthermore, the determining equation of our harmonic balance method is schematically described by coupled resistive DC, Cosine and Sine circuits, so that we can easily obtain the frequency response curves with the DC analysis of Spice. Thus, our approach is quite user-friendly, because we need not derive the circuit equation and the determining equations in our method.