Adaptive compensation of frequency response mismatches in high-resolution time-interleaved ADCs using a low-resolution ADC and a time-varying filter

This paper investigates the adaptive compensation of frequency response mismatches in an M-channel time-interleaved analog-to-digital converter (TI-ADC) using an extra low-resolution ADC and a time-varying FIR filter. The introduced compensation structure may be used to compensate any linear frequency response mismatches including time skew mismatches. The coefficients of the time-varying filter are adapted using the least-mean square (LMS) algorithm. The performance of the proposed compensation structure is demonstrated through numerical simulations.