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Operation mode of NMOS transistor, can someone check my work

  1. Apr 12, 2017 #1
    1. The problem statement, all variables and given/known data
    Vtn = 0.4V

    NMOS1
    Drain = 2.5V
    Gate = 1.9V
    Source = 0V

    NMOS2
    Drain = 0.5V
    Gate = 2.2V
    Source = -2.3V

    NMOS3
    Drain = 0.5V
    Gate = 0.9V
    Source = -2.5V

    2. Relevant equations


    3. The attempt at a solution
    NMOS1
    Vgs = Vg - Vs = 1.9V
    Vgd = Vg - Vd = -0.6V
    Vgd < Vtn and Vgs > Vtn
    Saturation Region

    NMOS2
    Vgs = Vg - Vs = 2.2 - (-2.3) = 4.5V
    Vgd = 2.2 - 0.5 = 1.7V
    Vgd > Vtn and Vgs > Vtn
    Triode/Linear/Ohmic region

    NMOS3
    Vgs = 0.9 - (-2.5) = 3.4V
    Vgd = 0.9-0.5 = 0.4V
    What region is the NMOS operating in if Vgd is equal to Vtn?
     
  2. jcsd
  3. Apr 17, 2017 #2
    Thanks for the thread! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post? The more details the better.
     
  4. May 5, 2017 #3

    rude man

    User Avatar
    Homework Helper
    Gold Member

    Hint: you're on the hairy edge, so to resolve the issue use the equations defining which operating region you're under.
     
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