A 3.2GS/s two-step subranging ADC is implemented in a 45nm SOI-CMOS technology. The measured ENOB is 4.55b at 1.6GHz. The IIP3 is -1.1dBm. The power consumption is 22mW from a 1.05V voltage supply for a FOM of 290fJ/ conversion-step. The chip occupies an active area of 0.07mm2. © 2012 IEEE.