can someone help me to resolve this problem?

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iscmos

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The attachment is the circuit and simulation results.
It is somehow a RC filter, but the resistance is determined by two switchs and capacitor, but I don't understand the operation even I know the results, so could someone give me some clues? Thanks
 

Switched capacitor circuits are handled in any modern analog IC text book, e. g. Razavi, Design of Analog CMOS IC. The basic theory can be found even at wikipedia.
 

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