A LOW-POWER 8-B 13.5-MHZ VIDEO CMOS ADC FOR VISIOPHONY ISDN APPLICATIONS

This paper describes a half-flash subranging 8-b 13.5-MHz video ADC us ing a new architecture (called ''overlapped architecture'') that combi nes the advantages of both flash and half-flash A/D converters. Its co nversion rate is that of a flash, without any multiplexing and with a low number of comparators. Its low power consumption and the small sil icon area required for its implementation enable it to be integrated i n mixed digital/analog circuits such as a video acquisition circuit de voted to visiophony applications. It has been manufactured using a CMO S 1-mum technology with two polysilicon and two metallization layers.