Abstract

A new self-consistent dynamic electro-thermal model for power HBTs is presented coupling a circuit-oriented electricalmodel, fitted on experimental data, with a full frequency domain thermal model. The thermal model provides the exact frequency behaviour of the device thermal impedance through a quasi-3D approach. The electro-thermal self-consistent solution is achieved, in large-signal periodic operation, through Harmonic Balance analysis. The model has been applied to the simulation of some HBT layouts from Alenia Marconi Systems.