A digital calibration technique for an ultra high-speed folding and interpolating analog-to-digital converter in 0.18-μm CMOS technology is presented.The similar digital calibration techniques are taken for high 3-bit flash converter and low 5-bit folding and interpolating converter,which are based on well-designed calibration reference, calibration DAC and comparators.The spice simulation and the measured results show the ADC produces 5.9 ENOB with calibration disabled and 7.2 ENOB with calibration enabled for high-frequency wide-bandwidth analog input.
