Signal processing and conversion

A method for error compensation in an analog-to-digital converter circuit (ADC) having a digital-to-analog converter circuit (DAC) that generates an analog signal used in converting an analog input signal to a digital signal, the method comprising:

• for each respective bit of a digital signal converted by the DAC,
• generating a feedback signal indicative of a mismatch between an analog output of the DAC, as converted to a digital signal by the ADC, and a digital signal input to the DAC;
• and
• applying a gain to the bit of the digital signal converted by the DAC based on the feedback signal;
• and
• compensating for errors in the DAC using the respective bits of the digital signal with the gain applied thereto;
• wherein generating the feedback signal includes multiplying the respective bit with a corresponding bit output by the ADC.

An apparatus for estimating and correcting errors in an analog-to-digital converter circuit (ADC), the apparatus comprising:

• a plurality of variable gain circuits respectively configured and arranged to apply a gain to a portion of a digital signal provided to a digital-to-analog converter circuit (DAC) based on feedback signals for each respective portion of the signal;
• a feedback circuit configured and arranged to generate the feedback signal for each DAC, each feedback signal being based on an output of the DAC for which it is provided and an input signal provided to the DAC, the feedback signal generated by subtracting an averaged value corresponding to the digital signals provided to all of the DACs;
• and
• an output circuit configured and arranged to correct the output of the ADC using the respective outputs of the variable gain circuits.