Calibration detector with two offset compensation loops

A calibration circuit comprising:

• a chopper circuit configured to receive a first signal and a second signal;
• a comparator circuit configured to:
• receive the first signal and the second signal from the chopper circuit;
• and
• provide a third signal indicating at least one of the first signal or the second signal;
• and
• a second circuit configured to:
• provide a first loop to adjust a first offset voltage associated with the comparator circuit and to provide a second loop to adjust a second offset voltage associated with the chopper circuit;
• determine that the first signal and the second signal are the same;
• and
• determine the first offset voltage associated with the comparator circuit in response to the second circuit detecting a first voltage associated with the third signal;
• wherein the first voltage associated with the third signal indicates the first offset voltage associated with the comparator circuit.

A method of adjusting a calibration circuit, the calibration circuit comprising a comparator, DAC cells, and a chopper circuit, the method comprising:

• adjusting a first offset voltage associated with the comparator;
• adjusting a second offset voltage associated with the chopper circuit;
• and
• providing, by a third circuit, a first voltage that offsets the first offset voltage associated with the comparator;
• wherein the first voltage has a first polarity that is different than a second polarity, wherein the first offset voltage associated with the comparator includes the second polarity.