PMOS trans-conductance formula

Discussion in 'Homework Help' started by Kai Chiang, Sep 2, 2016.

  1. Kai Chiang

    Thread Starter New Member

    Oct 27, 2015
    12
    0
    This is the formula in my lecture note for NMOS
    upload_2016-9-2_17-57-18.png ]
    for PMOS, is it something like this? I cant seem to find PMOS formula for this on the internet. Most of them shows the one in my lecture note
    upload_2016-9-2_17-58-49.png
    where |Vgs| = Vsg and |Vth| is VTHP
    which is upload_2016-9-2_18-0-36.png
     
  2. MrAl

    Well-Known Member

    Jun 17, 2014
    2,418
    488
    Hi,

    The only difference i've seen so far is the subscripts they use:
    Wn, Ln for NMOS
    Wp, Lp for PMOS
    IDn for NMOS
    -IDp for PMOS (different sign)

    I think gm is positive for both because the gate voltage is probably considered negative too for PMOS, but you can check into this.
     
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