THE IMPORTANCE O F CMOS flash A/D converter^"^'^ with superior cost-effectiveness and VLSI logic compatibility has increasingly been recognized for such applications as high-speed data acquisition and digital video-signal processing. However, they demand both a high conversion rate of above 20MIlz and a high-resolution of more than 8b; which have only recently been achieved with CMOS technology. This has been due to the lack of CMOS comparators suitable for use in this flash converter, which requires not only more stringent device-ratio matching for higher-resolution, but also high-speed and highdensity. This paper will cover a monolithic CMOS 8 b video-speed flash A/D converter using a high-speed offset-reduction comparator technique, which has experimentally shown the capability of a high-resolution of up to 9b and above at high videospeed. The converter was implemented by standard 2 p silicongate CMOS technology including only one capacitor process (AI-poly Si).
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