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op amp used in charge pumps for charge sharing / mismatch

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analog_ambi

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Hi,
In charge pumps to remove charge sharing a unity gain opamp is used.
Again to minise current mismatch or increase resistance of current sources, a servo opamp can be used as shown in razavi books.

I want to know which method is more helpful in minimising spurs?
I have power constaraint and want to use only one
 

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