How does the switched capacitor amplifier work?

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cxtdyl

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Hello everyone,

I'd'like to design a switched capacitor amplifier , But I don't know how does this amplifer work. Here is my own point of view: in the S1 phase, the circuit in the sampling phase, VCM and LM49 supply a CMFB; in the S2 phase , the circuit is amplified stage. However when I use the spectre simulation tran, in the S1 phase, the leftmost capacitor can not sampling the Vin. Is anything wrong with me, what is more, LM49 and LM47 are Vbiase voltage?(VDD=3.6V, VCM=1.8V, LM49=LM47=0.88V)
I hope anyone can help me. Best wishes for you!

Thank you!
 

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