AC gain confusion

Discussion in 'Homework Help' started by vustudent, Oct 16, 2010.

  1. vustudent

    Thread Starter Active Member

    Mar 11, 2009
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    for the below, with green be the output and red the input,
    green peaks at 654.248m, dips at 461.173m
    red peaks at 550m, dips at 450m

    would you say the gain is ~2?

    [​IMG]
     
    Last edited: Oct 16, 2010
  2. Georacer

    Moderator

    Nov 25, 2009
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    Yes, you would.
    This is the definition of gain on most transistor amplifier circuits.
     
  3. vustudent

    Thread Starter Active Member

    Mar 11, 2009
    38
    0
    Original question: AC input at zero bias + - 1 V , AC output 3V bias + - 1V, gain
    = 1?
    Sorry for changing the original question.

    But what if the peak of the output curve saturates at a certain value say
    you have AC input at zero bias + - 1 V, but output voltage that is in the range of [3.5 : 2], so it is no longer [4 , 2], would you say the gain is (3.5-2) / (1 - -1) = 0.75
     
    Last edited: Oct 16, 2010
  4. Georacer

    Moderator

    Nov 25, 2009
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    No, you measure the AC gain while the input is still undistorted. It is the job of the amplifier designer to ensure that the circuit with gain A won't saturate with in input with amplitude Vin. In fact, the maximum input amplitude that won't be distorted is a specification for each amplifier.
     
  5. Jony130

    AAC Fanatic!

    Feb 17, 2009
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    Show as full schematics
     
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