A 10 b 20-Msample/s 28 mW CMOS ADC in ASIC process

Abstract

We have developed a 20 Msample/s 10 b CMOS ADC with a 2.4 V power supply, in 0.35 /spl mu/m 1-poly 2-Metal ASIC process without a special analog process, which is suitable for embedding in ASICs because of the small area (4.84 mm/sup 2/) and small power consumption. To realize this ADC we have developed a 2-step interstage amplifying pipeline system and new circuit technologies for residue amplifiers. The prototype chip was fabricated and was measured. It shows good linearity of less than /spl plusmn/1 LSB and 28 mW power consumption with 2.4 V at 20 MHz sampling.