Explicit analysis of nonlinearities in time-interleaved ADC

Abstract

TIADC (Time-Interleaved ADC) architecture suffers from errors introduced by mismatches among the interleaved channels, which degrade performance of TIADC significantly. In this paper, a behavioral model for TIADC based on Wiener model is proposed to describe the nonlinearities in TIADC system. The time-domain and frequency-domain representations of the model are derived. Besides, the discrete-time equivalent model is proposed by transforming the hybrid TIADC model to a purely discrete time system, which is useful for the analysis and implementation of subsequent calibration method. What’s more, numerous studies have investigated compensation methods for discrete-time Wiener model. The methods in these papers can be modified easily for calibration of TIADC using the model proposed in this paper. The experiment results show the nonlinearities of TIADC in practice are consistent with the model proposed in this paper and simulation results indicates the validity of the proposed discrete-time equivalent model.