A scalable high power nonlinear HBT model for a 28V HVHBT

A scalable nonlinear HBT model for a Building Block (1BB) of 28V InGaP/GaAs HBT is presented. It is based on the AgilentHBT (AHBT) model. The building block consists of 32 finger HBTs, an input pre-matching circuit and a transistor used as an emitter follower in the related bias circuit. The P1dB of 1BB is 32.5dBm. The model can account not only for DC, thermal, junction capacitances, S-parameters but also RF power, gain, IM3, operation current and collector efficiency. A good match between simulation and measurement has been achieved. By using a multiplicity parameter the model can accurately predict the DC and nonlinear RF performance of two Building Blocks (64 fingers, P1dB of 35.7dBm) and four Building Blocks (128 fingers, P1dB of 38.2dBm).