Folded-Cascode CMos OPamp

folded cascode +cmos

what is an Folded-Cascode CMos OP-amp
do v have Folded-Cascode NMos OPamp also

introduction of cmos folded cascode op amp

A folded Cascode opamp is a particular configuration of a differential amplifier in which the input signal is least affected by the noise of one supply line, since the signal ideally does not have any reference to that line, it is taken in with respect to 1 supply line and then amplified with respect to the same supply line by a topology which folds the signal back to the same supply line.
You should read Razavi Chap 3 and 4 for understanding this properly. A folded cascode may be a PMOS or a NMOS configuration.

cmos folded cascode op amp design eda board

U may check an analog design book.
I don't know if you mean the Nmos input opamp by NMos OPamp.

folded cascode cmos opamp

First, when one's talking about NMOS or PMOS OPAs, it refers to the differential pair type.

For the clarity of my explanation, I will consider a NMOS differential pair.

Usually, when you are cascoding an NMOS differential pair of an OPA, you insert common gate NMOS transistors stacked above the NMOS differential pair. This cascode effect aims at multiplying the output resistance of the NMOS differential pair, as well as to enhance its input pole (for details, you should read Razavi's or Gray&Meyer's book).

However, as the supply voltage is lowering in modern technologies, it becomes difficult to stack transistors on top of the differential pair, because it consumes voltage headroom. So to cope with these low supplies, we use a PMOS common gate stage besides the differential pair to provide with the cascode effect. The PMOS transistors features their own current sources, and the laod transistors now becomes NMOS instead of former PMOS.