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MOSFET input Voltage for saturation region

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  1. Oct 15, 2014 #1
    I'm trying to solve for the minimum vIN such that MOSFET is in the saturation region. Here are the given parameters
    VS+ = 1.0 V
    VS- = - 1.0 V
    VT = 0.5 V

    In order to enter saturation I know that VDS > VGS - VT

    VGS = VIN - VS-

    VDS = Vs+ - Vs-, which is 2 V

    Which means
    2V > VIN - VS- - VT
    2V > VIN - (- 1.0 V) - 0.5 V
    2V > VIN + 0.5 V

    I get a VIN of 1.5 Volts. The correct answer is -0.5 V.


    I'm just starting to learn electrical engineering and it would be great if someone can point out what's missing.
     

    Attached Files:

  2. jcsd
  3. Oct 15, 2014 #2
    I figured it out.
    VGS > VT
    hence
    VIN - VS- > 0.5 V
    VIN + 1 > 0.5 V
    VIN = -0.5
    VIN can vary from -0.5 to 1.5;
     
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