A Compact 8-bit, 8 GS/s 8×TI SAR ADC in 16nm with 45dB SNDR and 5 GHz ERBW

Abstract

We present a time-interleaved (TI) SAR ADC with 8 channels realizing 8-bit conversion at 1 GS/s each. SNDR is 45 dB at low frequency with an ERBW of 5 GHz limited by sampler distortion. Conventional SAR conversion at high speed with minimum degradation is achieved by leveraging techniques such as early quantization, minimum delay logic, DAC redundancy and gain and offset compensation via the DAC. At 8 GS/s the ADC consumes 26 mW resulting in an efficiency of 30 fJ/conv.-step.