Investigation of Thermal Crunching Effects in Fishbone-Type Layout Power GaAs-HBTs

M. Rudolph, F. Schnieder, W. Heinrich

Ferdinand-Braun-Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Straße 4, D-12489 Berlin, Germany

Published in:
Dig. 12th GAAS Symposium, Amsterdam, 2004, p. 435-438.

Abstract:
Thermal current crunching in power HBTs is investigated by numerical simulation. Compact electro-thermal models are connected in parallel, thermal interaction is accounted for by a thermal resistance matrix. It turnes out that the dominant effect in HBTs of fishbone-type layout is that half of the HBT is effectively switched off. This can only be simulated by a slightly asymmetric model.

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