ADC HAVING CHOPPER OFFSET CANCELLATION

摘要

A circuit includes a differential amplifier circuit and a chopper offset cancellation circuit chopping a switched capacitor circuit. The offset cancellation mechanism including input cross-coupled switches coupled between a differential capacitive element and the amplifier circuit inputs and output cross-coupled switches coupled between the differential capacitive element and the amplifier circuit outputs for swapping the amplifier circuit inputs and outputs to cancel shpper offset. The circuit further including an input switch network coupled between differential input signal terminal sand the amplifier positive and negative inputs external to the integrating feedback configuration for swapping the differential input signal terminal connections to the amplifier positive and negative inputs. Moreover, the circuit including an output switch network coupled between differential output signal terminals and the amplifier positive and negative outputs external to the integrating feedback configuration.