Hello. Just a quick question. This is a folded cascode fully differential amplifier with a MOS as resistor CMFB. This uses an NMOS input pair topology. How should I configure it if my input pairs are PMOS? Would appreciate any feedback, no pun intended. Thank you!

P.S If it helps, the explanation for this setup can be viewed here

 

Hi,

Why dont you look at a simple single N transistor inverter with drain pullup resistor, then try to configure it into a P transistor inverter.
It ends up being something like an "upside down" version. The gate signal inverts, the 'on' output inverts, etc.
You can then apply that reasoning to the full circuit or whatever part you need to do. You also have to know what output is allowable for a given input.

Try looking at the schematics for these two types of inverters i would bet you could then figure it out.
Think in terms of what voltage levels you need on the input, and what voltage levels you get at the output.