A 10-b 600-MS/s 2-way time-interleaved SAR ADC with mean absolute deviation based background timing-skew calibration

This paper presents a time-interleaved (TI) successive-approximation register (SAR) analog-to-digital converter (ADC) with a novel mean absolute deviation (MAD) based timing-skew calibration technique. It features two highlights. First, Its computation complexity is very low, only involving subtraction and taking absolute value. Second, its convergence speed is fast with even random signals. A prototype 10-b 600-MS/s 2-way TI-SAR ADC in 40-nm CMOS achieves the peak SNDR of 56dB and 52 dB across the entire Nyquist band. Power consumption is 4.7mW and it leads to the Walden FoM of 23.8-fJ/conversion step.