A 600-MSample/s 6-bit folding and interpolating analog-to-digital converter（ADC） is presented.This ADC with single track-and-hold（T/H） circuits is based on cascaded folding amplifiers and input-connection-improved active interpolating amplifiers.The prototype ADC achieves 5.55 bits of the effective number of bits（ENOB） and 47.84 dB of the spurious free dynamic range（SFDR） at 10-MHz input and 4.3 bit of ENOB and 35.65 dB of SFDR at 200-MHz input with a 500 MS/s sampling rate; it achieves 5.48 bit of ENOB and 43.52 dB of SFDR at 1-MHz input and 4.66 bit of ENOB and 39.56 dB of SFDR at 30.1-MHz input with a 600-MS/s sampling rate.This ADC has a total power consumption of 25 mW from a 1.4 V supply voltage and occupies 0.17 mm^2 in the 0.13-μm CMOS process.
