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Value of Vout in PMOS Inverter?

by jean28
Tags: inverter, pmos, vout
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Feb6-13, 08:54 PM
P: 86
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).

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Feb6-13, 08:55 PM
P: 86
It could also be Vout = id * Rd.
Feb23-13, 05:42 AM
HW Helper
P: 5,141
Quote Quote by jean28 View Post
It could also be Vout = id * Rd.
If by Rd you mean that external resistor, then that looks right for output logic HIGH.

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