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This article deals about high speed integrated A to D converters. Flash converters achieve A to D conversion in a single clock cycle. They are fast devices by essence but area and power consumption increase exponentially with numbers of bits. Nine to ten-bit converters require large transistor sizes in order to cope with narrow offset tolerances of the comparators. Five to six bit resolution full-flash converters are more customary. Multistep converters take advantage of low-resolution flash devices. Full-flash converters is known as folding converters. The number of comparators is smaller than with full-flash devices to interpolation techniques. A 10-bit CMOS converter with a sample rate of 50 MS/s and 240mW power consumption has been reported.
Date of Conference: 2004