Ballasting of high power silicon-germanium heterojunction biploa

Active solid-state devices (e.g. – transistors – solid-state diode – Bipolar transistor structure – Including additional component in same – non-isolated structure

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257580, 257581, 257582, 257586, H01L 27082, H01L 27102, H01L 2970, H01L 3111

Patent

active

061304719

ABSTRACT:
A ballasted transistor structure reduces thermal runaway. A heterojunction bipolar junction transistor array includes a plurality of transistors, each having an emitter, a base and a collector. Each of the bases is an alloy of silicon and germanium and each of the collectors and emitters is silicon. A ballast resistor, of doped silicon, that prevents thermal runaway, is electrically connected to each of the collectors.

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