‡Department of Mechanical and Electronic Engineering

Distortion analysis in the frequency domain is very im-portant for designing the analog integrated circuits. We propose here a new method based on the SPICE-oriented harmonic balance method, where the Fourier transforma-tions to the bipolar transistors and/or MOSFETs are car-ried out using new Fourier transfer circuit model. The cir-cuit is composed of the analog behavior models(ABM) of SPICE, which can be applied to any kind of nonlinear cir-cuit elements described by the exponential and/or piecewise linear functions. 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 de-termining equations in our harmonic balance method. 1