US Patent 7602321 Adaptive composite analog to digital converter

A distortion correcting analog to digital converter (ADC) system includes a plurality of ADCs configured to convert an analog signal to a plurality of digital ADC outputs, wherein the plurality of ADCs are configured to generate a composite signal based on the plurality of ADC outputs, there is an offset between a first one of the plurality of ADC outputs and a second one of the plurality of ADC outputs, and the offset causing distortion in the composite signal. The distortion correcting ADC system further includes an adaptive module coupled to the plurality of ADCs, wherein the adaptive modules includes an adaptive filter having a filter response, and the adaptive module is configured to adaptively adjust the filter response to reduce the distortion in the composite signal. An adaptive module includes an interface configured to receive a composite signal that is a combination of a plurality of ADC outputs, and an adaptive filter coupled to the interface, wherein there is an offset between a first one of the plurality of ADC outputs and a second one of the plurality of ADC outputs, the offset causing distortion in the composite signal, the adaptive filter has a filter response, and the adaptive filter is configured to adapt the filter response to reduce the distortion.