Re: How do building up full differential folded-cascode mod
I guess what you really need is a fully differential OTA behav model in Verilog-A. If that is the case, you can build it with the prototype in ahdlLib and then exapnd it to include more non-ideal effects, such as finite bandwidth, output impedance, output swing, offset, etc. There is no need to really create a specific 'folded-cascode' OTA because it is merely one of the possible implementation.