A 2.4-mW 25-MHz BW 300-MS/s passive noise shaping SAR ADC with noise quantizer technique in 14-nm CMOS

Abstract

This paper presents a SAR ADC using passive noise shaping and noise quantizer techniques. A ping-pong residue switching enables noise shaping at high sampling rate. The prototype in 14 nm achieves 69-dB SNDR at 25-MHz BW and 300 MS/s. The FOMs and FOMw are 169 dB and 20.5 fJ/conv.-step, respectively. With noise shaping only, the SNDR is 66.2 dB at 33-MHz BW and 400 MS/s.