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# help for switched-capacitor circuits

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#### rainman.cn

##### Member level 2
hello,
Fig.1 is the switched capacitor circuit and fig.2 is the clock signal.
the paper say that the error term induced by the finite opamp gain is proportionsl toA(-2), we call this gain-enhanced or gain-squaring,
can anyone tell me how to find the transfer funnction, thanks very much.

regards,
rainman,

I donnot know how to get the result Vout/Vin=
(-C1/C2)/(1+(1+C1/C2)/A2), which A2 represent the square of A, anyone can help me ?

could you post that paper?

I think it is a filter design. You are writting the prenthesized clock phases trans-function. If don't ignore the gain error, I only get Vout/Vin=
(-C1/C2)/(1+(1+C1/C2)/A). I think you should better post your paper.

The paper has been posted,

this circuit is fig. 30 in the paper,

"Switched capacitor integrators with low finite gain sensitivity" Electronic Letters, Nov. 1985
The answer maybe in this paper,but I cann't get this paper.

I can post the paper here,
The paper only give the result,
I donnot know how to get the right result, can you help me ?
how can gain-squaring happen?

rainman.cn said:
hello,
Fig.1 is the switched capacitor circuit and fig.2 is the clock signal.
the paper say that the error term induced by the finite opamp gain is proportionsl toA(-2), we call this gain-enhanced or gain-squaring,
can anyone tell me how to find the transfer funnction, thanks very much.

regards,
rainman,

you should simplify this circuit to cz-1 ,cz-1/2 types, and calculate the z transfer function.

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