Patent ID: 7639073

Claim:
An apparatus, comprising: a two-stage operational amplifier (“OP-AMP”) including a first OP-AMP stage having an output coupled to an input of a second OP-AMP stage; an input switched-capacitor (“SC”) network coupled to an input of the first OP-AMP stage, the input SC network including switches coupled to sample an input signal during a first phase of operation of the apparatus and coupled to provide the sampled input signal to the input of the first OP-AMP stage during a second phase of operation of the apparatus; and a feedback SC network coupled to selectively couple the output of the first OP-AMP stage to the input of the first OP-AMP stage during the first phase of operation of the apparatus and to couple an output of the second OP-AMP stage to the input of the first OP-AMP stage during the second phase of operation of the apparatus.