Background calibration of random chopping non-idealities in data converters

A method for digitally removing offset error caused by chopping, comprising:

• chopping a differential analog signal to generate a chopped differential analog signal;
• updating an estimated offset correction term based on a digital version of the chopped differential analog signal and an error term representing the offset error caused by the chopping;
• generating an offset-corrected chopped digital output based on the estimated offset correction term and the digital version of the chopped differential analog signal;
• and
• unchopping the offset-corrected chopped digital output.

An apparatus comprising:

• analog means to randomly change a polarity of a differential analog signal and generate a chopped differential analog signal;
• means to quantize the chopped differential analog signal into a chopped digital signal;
• and
• digital means to:
• update an estimated offset correction term based on chopped digital signal and an error term representing an offset error caused by the analog means;
• generate an offset-corrected chopped digital output based on the estimated offset correction term and the chopped digital signal;
• and
• unchop the offset-corrected chopped digital output.