Abstract

A nonlinear model characterising two-terminal microwave active circuits under dynamic and steady-state conditions is developed from a generalised circuit approach. The model considers the active circuit as a black box consisting of a one-port passive circuit and a one-port active device. The response of the active and passive circuits to modulated time-dependent signals with slowly varying amplitude and phase is derived. The model takes into consideration the nonlinear dependence of the active-device currents on RF voltage amplitude and frequency; also it considers the effects of nonlinearities of the passive circuit on frequency. This makes the model suitable for applications which employ strongly modulated signals for which Van der Pol's cubic nonlinearity model fails.

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