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VCE sat for BJT

  1. Mar 23, 2007 #1
    Why is there a VCE sat for BJTs? Where does it come from?
    Can someone explain physically?
  2. jcsd
  3. Mar 23, 2007 #2
    Just skimming the surface, the BJT is in saturation when both junctions are forward biased. When that happens, the voltage across the collector with respect to the emitter is very small (~0V). In practice VCE(SAT)~= 0.2 V. Refer to any fine electronics text book (Sedra & Smith, Gray and Meyer, etc) for more information
  4. Mar 26, 2007 #3


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    Last edited: Mar 26, 2007
  5. Mar 26, 2007 #4
    mathematically, when Vce is trying to be a negative voltage it will actually appear as Vce(sat)

    don't quote me on it
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