Correlation-Based Frequency-Response Mismatch Compensation of Quad-TIADC Using Real Samples

This brief proposes a new digital architecture to compensate for the frequency-response mismatch that is specific to four-channel time-interleaved analog-to-digital converters (quad-TIADCs) using a linear periodic time-varying correction and an adaptive feed-backward design. Estimation of the correction parameters is performed iteratively by solving two linear systems based on correlation values of the real signal from the TIADC output. Problem formulation is well detailed and hardware implementation results demonstrate the efficiency of our method.