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Homework Help: Common Source MOSFET Amp problem

  1. Mar 20, 2014 #1
    1. The problem statement, all variables and given/known data

    A CS amplifier utilizes a MOSFET with μnCox = 400 μA/V2, W/L = 10, and VA=10v. It is biased at ID=0.2mA and uses RD=6k.

    Find Rin,AVO,RO

    2. Relevant equations

    VAO= -gm(RD||ro)


    3. The attempt at a solution

    I drew out the equivalent circuit with hybrid-pi model. Doesn't seem to tell me much.

    Not sure where to start. For the relevant equations above I'm missing gm and ro. I have a feeling "it is biased at ID=0.2mA" is a clue but I'm having trouble finding what that implies.
  2. jcsd
  3. Mar 20, 2014 #2
    ok nevermind I just figured it out.
    Last edited: Mar 20, 2014
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