1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Find output current of NMOS transistor

  1. Apr 12, 2017 #1
    1. The problem statement, all variables and given/known data
    Vtn = 0.4V
    W/L = 10
    NMOS1
    Saturation Region
    Drain = 2.5V
    Gate = 1.9V
    Source = 0V

    Vtn = 0.4V
    W/L = 10
    NMOS2
    Triode/Linear/Ohmic Region
    Drain = 0.5V
    Gate = 2.2V
    Source = -2.3V

    tox = 9um
    un = 250cm^2/V
    W/L = 10
    2. Relevant equations
    Saturation: Id = Kn * (Vgs-Vt)^2/2
    Triode/Linear/Ohmic: Id = Kn * ((Vgs-Vt)Vds - Vds^2/2)

    3. The attempt at a solution
    tox = 9nm
    un = 250cm^2/V
    cox = eox/tox = (3.9*8.85*10^-14F/cm)/9nm = 0.003835F/m^2
    kn = un*cox*W/L = 95.875uA/V^2

    NMOS1
    Ids = Kn * (Vgs-Vt)^2/2 = 1.08mA

    NMOS2
    Vds = Vd - Vs = 0.5-(-2.3)=2.8V
    Ids = Kn * (Vgs-Vt)(Vds) - Vds^2/2) = 7.248mA
     
  2. jcsd
  3. Apr 12, 2017 #2

    phyzguy

    User Avatar
    Science Advisor

    These look OK to me.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted