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Source Follower Large Signal - MOSFET amplifier

  1. Oct 13, 2012 #1
    t50yew.png

    I'm still not very confident in analyzing circuits. Here's what I know:

    1) v_o=v_IN - v_T
    2) id=k/2*(v_IN-v_T)^2
    3) v_o=v_S-(k/2)(v_IN-v_T)^2*RS
    4) v_o = v_S-id*Rs

    iDS = v_o/RS



    The answer I chose in the photo was based off of other online discussions. I'm very confused and don't have the slightest idea as to where to go. Any ideas appreciated.
     
  2. jcsd
  3. Oct 13, 2012 #2

    rude man

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    Equations 3 and 4 are wrong. Note that Vo and Vs are the same voltage!

    I would look carefully at eq. 2 ...
     
  4. Oct 13, 2012 #3

    rude man

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    Oh, BTW your answer is correct also. But for the given circuit, you don't know Vo.
     
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