Need a little help with homework

Discussion in 'Homework Help' started by ///m3dave, Nov 25, 2010.

  1. ///m3dave

    Thread Starter New Member

    Dec 8, 2009
    23
    0
    [​IMG][​IMG]The circuit is a 2 stage FET amp. I need to know how to figure out Av2 if C4 is open. I know how to get AV1, gm*R3, but can't figure out Av2. With Vin = 10mV rms. Any help would be appreciated.

    Thanks.
     
    Last edited: Nov 25, 2010
  2. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    5,448
    782
    The effective mid-band drain load for the second stage would be R6 in parallel with RL - call it Rp.

    With C4 open the second stage gain would be

    Av=-gm*Rp/(1+gm*R5)
     
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