High speed ultra wide band comparator in deep sub-micron CMOS

This paper presents the implementation of a high speed low power over sampled CMOS comparator for use in a reconfigurable Flash Analog to Digital Converter (ADC) as part of a Direct Sequence - Spread Spectrum (DS-SS) based Ultra Wide Band (UWB) Radio receiver. The comparator was designed using a 90 nanometre (nm) CMOS technology process. The switching speed of the comparator is 4 giga-samples per second (GSps) for a 528 megahertz (MHz) input bandwidth. The comparator operates on a 1V power supply. The total input referred offset of the comparator at 4 GSps is 33.1 mV which is about 0.6 LSB for a 4 bit flash converter.