pMOSFET Small SIgnal Model
In the derivation of the pMOS small signal model, the direction of current change as the voltage applied is reversed in polarity.
In other words, the small signal model of pMOS is the same as the small signal model of nMOS.
Figure 25 shows the small signal model of a pMOS transistor.
Figure 25: pMOS Small Signal Model
How do nMOSFET and pMOSFET differ
The mobility of electrons in nMOS is higher than the mobility of holes in pMOSFET.
pMOSFET has low current driving capability than nMOSFET
pMOSFET has lower transconductance than that of the nMOSFET
nMOSFET has comparatively higher output resistance than that of pMOSFET
nMOSFET provide more ideal current sources than that of the pMOSFET
nMOSFET have higher gain when used as amplifiers compared to pMOSFET
pMOSFET devices are less susceptible to interference than nMOSFET devices