An 8-b 650-MHz folding ADC

An 8-b 650-MHz folding analog-to-digital converter (ADC) with analog error correction in the comparators is presented. With an input frequency of 150 MHz, 7.8 effective bits are obtained. The ADC is implemented in a 1- mu m 13-GHz triple-level interconnect bipolar process, requiring 850 mW from a single -4.5 V supply. The die size is 4.2 mm/sup 2/.>