Bandwidth Mismatch Correction for a Two-Channel Time-Interleaved A/D Converter

Mismatches between sample-and-hold (S/H) circuits in a time-interleaved analog-to-digital data converter (ADC) cause undesirable distortions in the output spectrum. To reduce these undesired spectral components, we introduce a hybrid filter-bank model of a two channel time-interleaved ADC. The model allows the development of a digital domain correction technique that removes the first-order effects of S/H mismatches. A single FIR correction filter is required, and simulations demonstrate the effectiveness of the proposed correction method.