444 / 2019-02-27 12:50:10

A Statistics-Based Background Timing Skew Calibration Algorithm for Time-Interleaved ADCs

time-interleaved ADC,timing skew,calibration,cross-correlation

全体主题 > Algorithm

A modified statistics-based background calibration algorithm is proposed, which estimates and
compensates errors due to the timing skew of time-interleaved ADCs in a digital-mixing way. The mismatch-induced error signal is corrected by calculating the cross-correlation between each sub-ADC and an additional calibration ADC. The output of the supplementary channel is delayed during data processing, different from the conventional statistics-based method that is susceptible to quantization noise. Simulation results of an 8-bit 2-GS/s four-channel time-interleaved ADC behavioral model show that the proposed method is effective and efficient.