bipolar transistor inverted output

Discussion in 'Homework Help' started by smarch, Mar 25, 2010.

  1. smarch

    Thread Starter Active Member

    Mar 14, 2009
    52
    0
    Hi,

    Just one quick simple question, with a self-biasing transistor circuit, why when putting in a square wave input would you get an inverted output response?

     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
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  3. smarch

    Thread Starter Active Member

    Mar 14, 2009
    52
    0
    so what's the answer, i can't see anything in that link that explains to me why.
    thanks
     
  4. Bychon

    Member

    Mar 12, 2010
    469
    41
    When the base goes positive, the transistor turns on. That means currrent flows to ground and the collector has minimum voltage on it. When the base is grounded, the transistor is "off" and the voltage at the collector can't get through the transistor. Therefore, the voltage at the collector is "high"...whatever the supply voltage is.
     
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