simple switched capacitor circuit

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mahyar

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hi
I have problem simulating a simple switch capacitor circuit in cadence virtuoso. when I put a big resistor as feedback it works but since it is switched capacitor it shouldnt have that resistor so when i remove it it has no dc convergence.
Does anyone have a simple realized schematic in virtuoso I want to take a look maybe i can get some hints.
Regards,
M
 

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