I build a folded cascode amplifier with a common 4-capacitors-and-6-switches SC-CMFB. I use two phase non-overlap clock to drive the switches. in the simulation, I choose "tran", "pss"."pac" analysis. in the simulation, the input signal is continuous sin waveform, the output of the opamp is directly chosen as the output of the simulation (not after a SHA) . so you can see that, I use a continuous input signal go through a opamp with a SC-CFMB,is it rignt?
and in the result of pac, the differential gain of the opamp increse as the frequency of the clock decrease, I don't know why ,theoritically, the differential mode gain should have no relation with the SC-CMFB. Is there anyont having met this case?
besides, in the continuous CMFB, we can calculate the gain of the CMFB, but in the SC-CMFB, what's the correspondence of the gain in the SC-CMFB, or how do we evaluate the effect of the SC-CFMB?
thank you

hi,ywguo

I also realize that the capicitor with two non-overlap switches emulate a resistor. and this type of SC-CMFB can be viewes as a load composed of a capacitor parallel with a resistance, am I right?

it I am right, does it mean that if I use the sc-cfmb, I should get a higher open-loop gain of the opamp in order to get a equal gain as with a continuous cmfb?

thanks