Calibration of mismatch effects in time-interleaved analog-to-digital converters

Abstract

The performance of time-interleaved analogue-to-digital (A/D) converters is often significantly degraded by timing mismatch errors. In this project we explore methods for performing reconstruction of signals from recurrent non-uniform samples. We analyse how time-skews affect the spectrum of the output signal. Several methods for estimation of the unknown parameters (time-skew and gain), using techniques required only the outputs of the A/D converters, are represented in this paper. We also present a filter-bank which perform signal reconstruction from these estimates. It is assumed that the input signal is analog band-limited and that the time-skews, which are introduced by the system before each A/D, are smaller than the sampling interval. The system is described in time-domain.