Principle and performance analysis of low-power, high-speed, low-noise comparators

Abstract

This paper studies three different structures proposed in recent years and discusses their advantages and properties respectively. A modified strong-arm latch voltage comparator is adapted to 3GHz operating frequency through additional current paths in the pre-amplifier. A latch-type comparator with a dynamic-biased pre-amplifier (DA) greatly reduces energy and improves noise performance through the stabilization of the input common-mode voltage. An FIA comparator further reduces energy and noise and greatly enhances the delay performance and the robustness of the comparator against different input common-mode voltage.