A 0.2 - 8 MS/s 10b flexible SAR ADC achieving 0.35 - 2.5 fJ/conv-step and using self-quenched dynamic bias comparator

A 10b flexible SAR ADC is presented incorporating a self-quenched dynamic bias comparator and a self-triggered asynchronous delay line. The ADC is fabricated in 65nm CMOS, occupies 0.04mm² and has an ENOB > 9bit and SFDR >66dB for sampling rates from 0.2 to 8MS/s at supply voltages respectively from 0.7V to 1.3V with a Walden FoM from 0.35 to 2.5fJ/conv-step. Keywords: SAR ADC, flexible, Walden Figure-of-Merit, SNDR, dynamic bias.