Analysis and compensation of nonlinearity mismatches in time-interleaved ADC arrays

Time-interleaved ADCs (TIADCs) are used to achieve high sampling rates. The drawback of such an architecture are mismatch effects, which decrease the signal-to-noise and distortion ratio (SINAD) and the spurious-free dynamic range (SFDR). Many papers have investigated the problem of mismatches but very few have considered he problem of nonlinearity mismatches. We present a mathematical framework for nonlinearity mismatches, describe their main characteristics, and show an effective compensation method to increase the SFDR.