baohulu
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china
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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
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