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A p-channel metal-oxide semiconductor (pMOS) transistor which has has p-type carriers used in the channel. The channel is established by a negative voltage on the gate which inverts the substrate (NWell) under the gate which turns the device on. The term may also be used to describe logic circuits built around pMOS transistors.

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High frequency small signal model of PMOS vs NMOS

, the final high frequency SS PMOS model ends up similar to the NMOS but I don't have the intuition for why the current source in the high frequency NMOS picture above had current going down from gate … to source so I'm not sure if that direction should be reversed for PMOS