Value of Vout in PMOS Inverter?

Discussion in 'Homework Help' started by jean28, Feb 6, 2013.

  1. jean28

    Thread Starter Member

    Sep 5, 2012
    76
    0
    Hey guys. I am simply trying to derive the equation for Vout in a PMOS inverter (attached). I know that in an NMOS inverter (which has the resistor in top of the transistor instead of the bottom) the equation for Vout is:

    Vdd - id*rd.

    But how does the resistor being in the bottom change this behavior? Is it now Vcc - ground? (which would equal Vcc).

    Thanks.
     
  2. jean28

    Thread Starter Member

    Sep 5, 2012
    76
    0
    It could also be Vout = id * Rd.
     
  3. Jony130

    AAC Fanatic!

    Feb 17, 2009
    3,957
    1,097
    Yes

    Vout = Id*Rd

    and in saturation region

    Id = K/2*(Vgs - Vp)^2
     
Loading...