Calibration of Timing mismatch in TIADC Based on Monotonicity Detecting of Sampled Data

Abstract

In this paper, a calibration method aiming at the timing mismatch existing in the TIADC (Time-Interleaved Analog-to-Digital Converter) is proposed. Monotonicity detecting of the sampled data is employed to estimate the mismatch error, in which only additive operation is involved. Besides that, an improved Taylor expansion method is used to compensate the mismatch error. The processes of the estimation and the compensation are designed to constitute an adaptive loop, so that the calibration can be run in real-time. Compared with other approaches, this method consumes less hardware resources and has a good calibration result.