SMALL-SIGNAL HARMONIC-ANALYSIS OF NONLINEAR CIRCUITS

An approximate harmonic analysis method for non-linear circuits is int roduced. The method solves the steady state, time domain representatio n as well as the frequency response of non-linear circuits. It allows simulation of non-ideal switched capacitor circuits composed of any ki nds of linear components and non-linear transistors as switches. All s witches must have the same period, but they can be opened and closed a t any time. The method proposed may also be applied to mixer analysis for the case of strong LO and weak RF signals. Examples are given to d emonstrate that the method is efficient and sufficiently fast to be us ed in circuit design. The simulation results show good agreement with those obtained by harmonic balance and transient analysis.