AWE macromodels for nonlinear circuits

Asymptotic Waveform Evaluation (AWE) is an efficient and general technique for simulating linear(ized) circuits. This paper presents a strategy for macromodelling nonlinear circuits with AWE. These multi-region AWE macromodels represent an extension of piecewise linear models, with the addition of internal states. Each region represents an AWE approximation to a linearization (at some bias point) of the nonlinear circuit of interest. In addition a technique is presented for initializing the internal states for model transitions from one linearization to another during a transient simulation