A single channel,6-bit 410-MS/s 3bits/stage asynchronous SAR ADC based on resistive DAC

This paper presents a single channel,low power 6-bit 410-MS/s asynchronous successive approximation register analog-to-digital converter(SAR ADC) for ultrawide bandwidth(UWB) communication,prototyped in a SMIC 65-nm process.Based on the 3 bits/stage structure,resistive DAC,and the modified asynchronous successive approximation register control logic,the proposed ADC attains a peak spurious-free dynamic range(SFDR) of41.95 dB,and a signal-to-noise and distortion ratio(SNDR) of 28.52 dB for 370 MS/s.At the sampling rate of410 MS/s,this design still performs well with a 40.71-dB SFDR and 30.02-dB SNDR.A four-input dynamic comparator is designed so as to decrease the power consumption.The measurement results indicate that this SAR ADC consumes 2.03 mW,corresponding to a figure of merit of 189.17 fj/step at 410 MS/s.