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Common Mode Feedback Test Circuit

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Majid_Vatan_Parast

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Hi
I have designed a capacitive common mode feedback ,but I do not know ho to test if it works or not. Can anyone suggest me a test bench circuit for common mode feedback?
Picture below is schematic of my circuit.
Thanks in advance Capture.PNG
 

I don't want to draw a schematic, but if you slowly change the Vcm in transient analysis the output common-mode voltage should follow it with some delay. I would test it in this way, with and without differential input signal.
Or run pss analysis, sweep the Vcm as parameter and calculate the average of the output common-mode voltage.
 

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