A 4x Time Interleaved SAR ADC with Common-Mode Injecting Skew-Detection Method

Abstract

This paper proposes a 4-channel time-interleaved successive approximation register analog to digital converter (TI-SAR ADC). The proposed TI-SAR ADC adopts a common-mode injection technique to achieve efficient skew detection. In addition, by employing a switched-capacitor integrator operating at a lower speed than the ADC sampling rate, low-power, background skew detection is realized. The proposed ADC achieves an SNDR of 61.3 dB at a sampling rate of 800 MS/s, while consuming 5.58mW of power and achieving a FoM_w of 7.73 fJ/conv-step.