Switched capacitor circuit - effect of input capacitance

[mvj]

Dear All,

May I know the effect of input capacitance on the accuracy of a switched capacitor circuit in general (differential multiply by 2 circuit in specific).

Thanks a lot in advance!!

Best Regards,
M.

 

[ic98]

Clarify your Q more.

 

[mvj]

Does the amplifiers input capacitance have any effect on the multiply by 2 operation, will it introduce any amount of error?

Thank you,
M.

 

[leo_o2]

It might influence. Input capacitance of amplifier might have charge sharing with switched capacitors.

 

[FvM]

Yes, input capacitance in combination with finite amplifier gain causes a gain error. You'll find the basic equations in text books, e.g. Razavi.