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connection of Gm in a charge sampling filter

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hoda ahmed

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Hello,
please I have a question
How is the output current (I=Gm*vin) from a folded cascode transconductance block taken to be introduced to the integrating switch " controlled by clock" to be integrated on the sampling capacitance of a charge sampling filter ? , from which node should the output be taken ? , the output current taken from the output node isn't the required current " I= Gm*vin" !.

Thanks in advance ! :)
 

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