Patent ID: 9564859
Date: 2017-02-07
CPC Classifications: H03F

Claim:
1. An operational-amplifier (OP-AMP) circuit comprising: a signal amplification path comprising a signal amplifier and an output stage, the signal amplification path being configured to amplify an input voltage received at an input to provide an output voltage via the output stage; and an offset-reduction path coupled to the input of the signal amplification path and to an output of the signal amplifier, the offset-reduction path comprising a transconductance amplifier and at least one chopper that are configured to mitigate noise in the signal amplification path and a noise-filtering feedback path configured to provide chopper feedback with respect to an offset voltage associated with the offset-reduction path, the noise-filtering feedback path comprising a feedback path input coupled to the input of the transconductance amplifier via a resistor.