Patent ID: 8638166

Claim:
An amplifier comprising: a plurality of amplification stages configured to amplify a differential input voltage signal to generate an output signal; a chopper block configured to chop an amplified differential signal associated with the plurality of amplification stages at a chopping frequency to generate a chopped signal; and a notch filter configured to attenuate the chopped signal at the chopping frequency to generate a notched signal, wherein the notch filter comprises: a first finite impulse response (FIR) filter configured to sample the chopped signal to generate a first plurality of samples as an output; a second FIR filter configured to sample the chopped signal to generate a second plurality of samples, wherein at least of portion of the first plurality of samples are interleaved in time with respect to the second plurality of samples as an output; and an infinite impulse response (IIR) filter configured to generate the notched signal at least in part by integrating the output of the first FIR filter and the output of the second FIR filter.