Abstract
An empirical model of a heterojunction bipolar transistor is presented. The model expands the Gummel-Poon equations to account for device self-heating, base current reversal, and the collector-emitter offset voltage. It is shown that self-heating has implications for the cutoff frequency of the HBT, for the frequency response of a small-signal amplifier, and also for the thermal stability of a current mirror circuit.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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