Abstract

The temperature dependence of emitter-base reverse stress degradation in bipolar transistors for Bi-CMOS circuits was studied. A suitable measure of degradation in the operating temperature range was chosen after careful consideration of the fact that bipolar transistor characteristics are very sensitive to temperature changes. The worst-case temperature conditions within the transistors' operating range were determined. Degradation was found to be worst at around 50/spl deg/C-a result of a tradeoff between thermal recovery from degradation and the effects of bandgap narrowing on bipolar characteristics. The recovery phenomena which had taken place after degradation were also investigated in detail.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

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