Novel sampling timing background calibration for time-interleaved A/D converters

Abstract

Novel sampling-timing background calibration for time-interleaved A/D converters has been proposed and verified by simulation. An FIR(Finite Impulse Response)-filter structure exploiting the sampling theorem provides simple but accurate time derivative of converted signal and hence enables reliable estimation and compensation of sampling-timing deviation of each unit ADC assisted by reference converter and LMS(Least Mean Square) algorithm. It has also been confirmed that the sampling-timing calibration can successfully be combined with proposed gain and DC-offset calibrations.