INTERLEAVED ANALOG TO DIGITAL CONVERTER WITH COMPENSATION FOR PARAMETER MISMATCH AMONG INDIVIDUAL CONVERTERS

摘要

Interleaved analog to digital converter with compensation for parameter mismatch among individual converters. A reference ADC samples an input signal at substantially the same time instances as an individual converter used in the interleaved ADC. The reference values provided by the reference ADC are compared with the digital codes generated by the converter to generate an error value from which estimates of the gain, DC offset and timing errors are computed using statistical techniques. Timing error thus estimated is used to change the phase of the sampling clock provided to the converter, and the gain and DC offset errors estimated are applied to modify the values of reference voltages applied to the converter, thus compensating for parameter mismatches.