Nonlinear Modeling Including the Self Heating Effect and Load-Pull Measurements of GaInP/GaAs Power HBTs

A practical method to model HBTs including the self-heating effect has been developed and implemented in the utilized software package LIBRA as a simple test bench. This method is based on a practical thermal feedback circuit, which is combined with the standard BJT Gummel-Poon model to account for the self-heating effect. The Self-Heating Effect has a remarkable influence on the large signal behaviour of the device especially at high power conditions. This fact has been demonstrated with power and load-pull measurements and verified with the developed model. Excellent agreement between the modeled and the measured power performance has been achieved.