Bjt conductivity modulation

Discussion in 'Homework Help' started by Cerkit, Oct 21, 2009.

  1. Cerkit

    Thread Starter Active Member

    Jan 4, 2009
    275
    3
    Hi. In most bjt operation explanations they say that initially the emitter base junction is forward biased ("turned on") but they don't mention anything about conductivity modulation. Whereby when the base collector junction becomes forward biased through Vbc>0 only then do they mention conductivity modulation.
    Doesn't conductivity modulation occur in the base emitter junction as well??
     
  2. Ratch

    New Member

    Mar 20, 2007
    1,068
    3
    Cerkit,

    You are right about that. I have never heard of that term before. Where did you come across it?

    What have you been reading? In the linear region, the base-collector junction is reversed biased.

    I don't know, what does "conductivity modulation" it mean? Both junctions work in a unified manner.

    Ratch
     
  3. Cerkit

    Thread Starter Active Member

    Jan 4, 2009
    275
    3
    Conductivity modulation is when the conductivity of a region has been enhanced. This is when due an applied voltage there is an injection of holes into the n region of collector and due to this there is an influx of electrons to balance the space charge.
     
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