A low-voltage low-offset dual strong-arm latch comparator

Abstract

© 2017 IEEE. A dual strong-arm (DSA) comparator is designed targeting at low-voltage operation in deeply-scaled technologies. The addition of a second regenerative latch helps reduce both offset sensitivity and offset while maintaining comparable or better performance as a conventional double-tail latch across a wide range of voltages. A large comparator offset measurement array is fabricated in a 28nm FDSOI process. The DSA offset is measured to be 8.5mV across 6 dies, approximately 30% lower than the conventional topology at iso-area and iso-capacitance conditions. It is also shown to scale well with supply and commonmode voltage, achieving up to 65% lower offset across the voltage range.