An Inherently Monotonic 7 Bit CMOS ADC for Video Applications

This paper describes a CMOS 7 bit flash analogue to digital converter capable of operation at sample rates in excess of 22 MSPS with an analogue bandwidth to ±¿ 1sb of 5MHz. The device has been realised on a 2.5¿m double layer metal CMOS process. Monotonicity is guaranteed by the decoding scheme and the accuracy is defined by the inherent matching of the device threshold voltages in the comparator input stages.