Correlation-based reconfigurable blind calibration for timing mismatches in TI-ADCs

Mismatches between sub-channels limit the dynamic performance of time-interleaved analog-to-digital converters (TI-ADCs). This paper proposes a correlation-based method of calibration for timing mismatches in M-channel TI-ADCs by using the cross-correlation between sub-channels of the output signals to estimate the temporal deviations. The output signal is calibrated by reducing the arbitrary order distortion, which is approximated by multiplying the distortions with the estimated coefficients of mismatch. Furthermore, a reconfigurable strategy composed of stages of arbitrary calibration is proposed to achieve suitable stages with the requisite dynamic performance. Finally, the calibration performance of the proposed method is verified through simulations that use different input signals and strengths of mismatch.