A 100-MSPS 8-b CMOS subranging ADC with parametric operation from 3.8 V down to 2.2 V

A 100-MSPS 8-bit ADC obtains very low supply voltage operation with four circuit techniques: differential T-gate boosting, a unified coarse/fine analog channel with dual gain, a supply independent delay generator, and a delay-lock loop digital output driver. A maximum DNL below 0.5 LSB and 7.0 (7.3) effective bits for a 50 MHz (10 MHz) input are maintained down to 2.2 V, 84 mW.