A 5-bit 1-GS/s Flash-ADC in 0.13-μm CMOS Using Active Interpolation

This work presents a 5-bit 1-GS/s flash-ADC in 0.13-μm CMOS technology. An active interpolation topology is used in the comparator inputs to reduce power consumption and input capacitance of the converter. Operating at 1.056-GS/s the ADC consumes 46 mW of power from a 1.2 V supply and provides an ENOB of 4.73 bits and an SFDR of 43.2 dBc at a signal frequency of 102 MHz. The ADC has an ERBW of 470 MHz and a FoM of 1.8 pJ/convstep. Area consumption for the converter is 0.2 mm².