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Collector signal delay in the presence of velocity overshoot

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2 Author(s)
Laux, S.E. ; IBM Thomas J. Watson Res. Center, Yorktown Heights, NY, USA ; Lee Wai

It is pointed out that the well-known expression equating the collector signal delay to one-half of the transit time through the base-collector depletion region is incorrect in the presence of a nonconstant carrier velocity, as occurs in the case of velocity overshoot. The correct expression yields a smaller signal delay than the conventional estimate for typical situations, further emphasizing the benefit of velocity overshoot in bipolar devices.<>

Published in:

Electron Device Letters, IEEE  (Volume:11 ,  Issue: 4 )