Spectrum distribution-based blind calibration method of mismatches for time-interleaved ADCs

This brief proposes a calibration method for offset, gain, and timing-skew mismatches in time-interleaved analog-to-digital converters. The calibration method includes the estimation method and the correction method. The estimation method is based on the difference between the spectral distribution of the error harmonics and the input signal. The correction method adopts sequential correction. Simulation results demonstrate that the proposed method calibrated all three mismatches simultaneously and eased the limit for input signals compared with the traditional method.