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A physical, yet simple, small-signal equivalent circuit for the heterojunction bipolar transistor

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3 Author(s)
Gobert, Y. ; Fraunhofer-Inst. fur Angewandte Festkorperphys., Freiburg, Germany ; Tasker, P.J. ; Bachem, K.H.

A physical, yet simple, small-signal equivalent circuit for the heterojunction bipolar transistor (HBT) is proposed. This circuit was established by analyzing in detail the physical operation of the HBT. The model verification was carried out by comparison of the measured and simulated S- and Z-parameters for both passive (reverse-biased) and active bias conditions. A feature of this model is that it uses a direct extraction method to determine the parasitic elements, in particular, the parasitic capacitances. The excellent agreement between the measured and simulated parameters was verified all over the frequency range from 0.25 to 75 GHz

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:45 ,  Issue: 1 )

Date of Publication:

Jan 1997

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