Self-heating effect compensation in HBTs and its analysis and simulation

A simple technique, inserting a specified resistance in the bias circuit, to compensate self-heating effect in DC and pulse characteristics of HBTs is proposed and demonstrated. Utilizing the bias scheme dependence of HBT behaviors, the compensation is achieved due to the cancellation of the positive and negative thermal-electric feedback inside HBTs. An analytical expression relating the specified resistance with the physical parameters of HBT is presented. The accurate simulation of both the self-heating effect and its compensation is, for the first time, demonstrated with a modified Gummel-Poon model.