Patent ID: 7595678

Claim:
A switched-capacitor circuit comprising: a first pair of differential inputs and a second pair of differential inputs; a p-channel switched-capacitor integrator having a set of p-channel input transistors; a first pair of sampling capacitors and a first pair of integration capacitors, wherein each of said first pair of sampling capacitors is selectively connected to one of said first pair of differential inputs or one of said p-channel input transistors via a first set of switches; an n-channel switched-capacitor integrator having a set of n-channel input transistors, wherein said p-channel switched-capacitor integrator and said n-channel switched-capacitor integrator function together in a push-pull fashion such that a required transconductance as well as width and drain current of said n-channel and p-channel input transistors are reduced by half; and a second pair of sampling capacitors and a second pair of integration capacitors, wherein each of said second pair of sampling capacitors is selectively connected to one of said second pair of differential inputs or one of said n-channel input transistors via a second set of switches.