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pmos can work up to very low voltages,coz it requires less gate drive.
but it will have large pole.,
need to be careful in compensation.
for nmos it wont work at low frequencies.,
but it will have higher current capability,so more gm and pole at higher distances coz of high transconductances.
no, NMOS needs a voltage supply HIGHER than vdd to achieve low dropout, such as an on-board charge pump. If you can accept this (takes a lot of supply current when the pump is running) then NMOS will beat PMOS every time in both device size and ease of compensation. Also, with less poles you can usually get the bandwidth (response) of the NMOS device higher.
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