Abstract: An electrical circuit comprising a modulating chopper configured to receive a differential input signal at a first frequency and modulate the differential input signal to a second frequency to form a modulated differential signal, a null amplifier coupled to the modulating chopper and configured to amplify the modulated differential signal to form an amplifier output, wherein amplifying the modulated differential signal causes a ripple in the amplifier output, a demodulating chopper coupled to the null amplifier and configured to demodulate the amplifier output to form a demodulated differential signal having a first portion at the first frequency and a second portion at a third frequency, an integrator coupled to the demodulating chopper and configured to integrate the demodulated differential signal to form an integrated differential signal, and an attenuator coupled to the integrator and configured to attenuate the integrated differential signal to compensate for at least part of the ripple.

Abstract: An electrical circuit comprising a modulating chopper configured to receive a differential input signal at a first frequency and modulate the differential input signal to a second frequency to form a modulated differential signal, a null amplifier coupled to the modulating chopper and configured to amplify the modulated differential signal to form an amplifier output, wherein amplifying the modulated differential signal causes a ripple in the amplifier output, a demodulating chopper coupled to the null amplifier and configured to demodulate the amplifier output to form a demodulated differential signal having a first portion at the first frequency and a second portion at a third frequency, an integrator coupled to the demodulating chopper and configured to integrate the demodulated differential signal to form an integrated differential signal, and an attenuator coupled to the integrator and configured to attenuate the integrated differential signal to compensate for at least part of the ripple.