A digital correction approach of mismatches for M-channel time-interleaved ADCs

We propose a blind correction approach to eliminate the distortion imported by timing skew, gain and offset mismatches in time-interleaved analog to digital converters (TIADC). The approach works in digital domain which can be used in M-channel TIADC. The correction algorithm for timing skew mismatch is based on synthesis filter banks and the estimation algorithm uses the cross correlation of adjacent channels in TIADC system. The proposed blind correction approach can follow the mismatches and has a low complexity. Simulation results show that the proposed blind calibration method has good estimation accuracy and makes a good performance in distortional TIADC system.