Abstract
A new direct parameter-extraction technique applied to the small-signal equivalent circuit of heterojunction bipolar transistor (HBT) is presented. The method is based on first determining the parasitic elements and then the intrinsic elements analytically. Concerning the intrinsic parameters, all the elements are extracted using exact closed-form equations derived in terms of S-parameters by reducing the small-signal models to the simplified using peeling algorithm. The validity of the new extraction methodology is demonstrated by applying it to a 1 × 15 µm2 InP HBT device within the frequency range of 0.1---40 GHz.
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