20120075129 | CALIBRATION OF IMPAIRMENTS IN A MULTICHANNEL TIME-INTERLEAVED ADC - Techniques for correcting component mismatches in an M-channel time-interleaved Analog to Digital Converter (ADC). A number, M, of clock signals drive a corresponding number of main ADC elements with a selected plurality of different clock phases. Each of the ADCs has at least one of an offset correction input, a gain correction input, or a phase correction input. The M digital values output by the ADCs are interleaved to form a digital representation of the input signal. Also provided is a reference ADC that outputs reference digital values in response to at least one of the M clock signals at a time. The output of the reference ADC is compared and/or combined with the output from a selected one of the main ADCs to provide an estimate of offset, gain or phase. The error is accumulated to determine a corresponding correction of offset, gain or phase which is then fed back to the respective input of the corresponding main ADC. | 03-29-2012 |