I. Introduction
Computer-aided Design (CAD) tools are essential to wireless communication circuit design. In particular, power amplifier (PA) design is especially reliant on nonlinear simulations, especially Harmonic Balance (HB) simulations. However, the effectiveness of these simulations as design-aiding tools is constrained by the accuracy of transistor models. In this context, high-power transistors or new technologies commonly lack high-quality equivalent-circuit models, requiring alternative approaches [1] for using CAD.