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Use of surface passivation ledges and local negative feedback to reduce amplitude modulation noise in AlGaAs/GaAs heterojunction bipolar transistors

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2 Author(s)
D. Costa ; Central Res. Labs., Texas Instrum. Inc., Dallas, TX, USA ; A. Khatibzadeh

It is shown that the use of surface passivation ledges and local negative feedback with an unbypassed emitter resistance reduce the AM noise of AlGaAs/GaAs heterojunction bipolar transistors (HBT's). The simultaneous use of both techniques improves the AM noise by 9 dB at 100 Hz offset. The correspondence between reductions in baseband noise and AM noise are described.<>

Published in:

IEEE Microwave and Guided Wave Letters  (Volume:4 ,  Issue: 2 )