A 6b 3GS/s 11mW fully dynamic flash ADC in 40nm CMOS with reduced number of comparators

Abstract

A 6b 3GS/s fully dynamic flash ADC is fabricated in 40nm CMOS and occupies 0.021mm2. Dynamic comparators with digitally controlled built-in offset are realized with imbalanced tails. Half of the comparators are substituted with simple SR latches. The ADC achieves SNDRs of 36.2dB and 33.1dB at DC and Nyquist, respectively, while consuming 11mW from a 1.1V supply.