Block processing with iterative correction filters for time-interleaved ADCs

This paper presents a systematic approach to block processing with iterative correction filters for time-interleaved analog-to-digital converters (TI-ADCs). TI-ADCs consist of several channels and can significantly increase the achievable sampling rate, but suffer from mismatches among the channels. Iterative digital correction filters are a general approach to mitigate the impact of mismatches in TI-ADCs. To reduce the requirements on the digital hardware, we introduce block processing for such filters. To this end, the transformation of a single-input single-output linear time-varying (LTV) finite impulse response filter into a multiple-input multiple-output LTV filter is described as a design equation and applied to two representative iterative correction structures from the literature. Finally, the beneficial properties and advantages of the transformation are high-lighted.