Performance Analysis of Low-Power CMOS Dynamic Comparators

Abstract

This paper studies four structures of CMOS dynamic comparators introduced in recent years. Based on conventional double-tail comparator, a comparator with a tail capacitor prevents output nodes of preamplifier from completely discharging to reduce energy consumption. Another comparator with a cross-coupled pairs achieves the same purpose of the first design. A comparator adds a floating inverter amplifier (FIA) to realize both dynamic bias and current reuse, achieve low energy consumption and be insensitive to the VCM. The triple-latch feed-forward (TLFF) comparator decreases delay conspicuously.