A sampling clock skew correction technique for time-interleaved SAR ADCs

Abstract

A technique for sampling clock skew correction by adjusting the delay in the input signal to each channel in a time-interleaved (TI) ADC is proposed. A proof-of-concept TI ADC employing this technique was implemented in a 65 nm CMOS process. The four-way TI ADC operates at an effective sampling rate of 150 MS/s, and achieves 60.2 dB and 58.2 dB SNDR for an input signal frequency of 2.1 MHz and 74.1 MHz, respectively. The ADC consumes 12.4 mW from a 1.2 V supply and occupies an area of 0.9 mm2.