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
    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
    where |Vgs| = Vsg and |Vth| is VTHP
    which is upload_2016-9-2_18-0-36.png
  2. MrAl

    Distinguished Member

    Jun 17, 2014

    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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