Small-sized collector-up Ge/GaAs heterojunction bipolar transistors with high gain, low base resistance, and high f/sub max/

Abstract

Small-sized collector-up Ge/GaAs HBT's are successfully fabricated and their operation at a high collector current density and at a high frequency is realized for the first time. The current gain of these devices reaches a peak value as large as 200 at a current density 6/spl times/10/sup 4/ Acm/sup /spl minus/2/, and no degradation in the current gain is… (More)

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