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feedback calculations

Discussion in 'Electronics Homework Help' started by gringo8217, May 29, 2013.

  1. gringo8217

    gringo8217

    22
    0
    Mar 20, 2012
    Hi
    can some please check the following calculations plz as i am not quite sure.

    a common emitter amplifier has a mid-frequency open loop voltage gain of AV=-10^4.If 2% negative feedback is applied ,determine the gain with feedback Avf

    Avf =Av/1+(AvB) = -10^4/1+(-10^4*0.02)= 50.25125628

    cheers
    gringo 8217
     
  2. DuctDuck

    DuctDuck

    52
    0
    Jan 26, 2013
    Small oops in your Avf equation; you're subtracting not adding...

    Avf= Av/(1-AvB)

    The last part seems odd, but that could be your wording (e.g.- 2% of 10k is 200; that's my interpretation, sorry).
     
    Last edited: May 30, 2013
  3. gringo8217

    gringo8217

    22
    0
    Mar 20, 2012
    Thank you
    gringo 8217
     
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