Estiamtion and Correction of Mismatch Errors in Time-Interleaved ADCs

In data acquisition systems, with help of time-interleaved analog-to-digital converter (TIADC) architecture, the maximum sample rate of the whole system can be increased efficiently. However, inevitable offset mismatch, gain mismatch, and timing error between time-interleaved channels degrade the sampling performance. In order to develop the mismatched TIADC structure, this paper first proposes a new time-domain algorithm to estimate the three aforementioned mismatch errors, and then puts forward a calibration method to calibrate the mismatch errors. Finally, numerical simulations are presented to verify the proposed estimation and calibration algorithm.