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Finding the max. level of input signal in a mosfet

  1. Apr 8, 2012 #1
    1. The problem statement, all variables and given/known data

    2222-14.png

    2. Relevant equations

    values in part (a) and (b) which i had found:
    gm = 2.2mS
    ro = 25kΩ
    Rin = 1MΩ
    Rout = 446.43Ω
    Av = 0.99


    3. The attempt at a solution

    all that i know is that when they refer to pinch off region, it is refering to the saturation region which means:
    VDS ≥ VGS - VTN, where VTN = 1
    therefore VDS ≥ 5 -1 = 4

    solution given:
    VDS ≥ 4
    -Vo ≥ 4
    Vo ≤ 4
    Av Vi ≤ 4
    therefore,
    Vi≤ 4/Av
    Vi≤ 4/0.99
    Vi≤ 4.04V (ans)


    my qn would be how did they show that
    VDS ≥ 4
    -Vo ≥ 4
     
  2. jcsd
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