A Design Procedure for Sizing Comparators in Active Rectifiers using $g_{m}/I_{D}$ Technique

Abstract

This paper introduces a design strategy for common-gate comparators, as the widely implemented comparators in active rectification systems. The method is based on the $g_{m}/I_{D}$ technique and it embraces both the power conversion efficiency of the whole system and large signal performance parameters, such as the slew-rate. As an example, the proposed strategy has been adopted to design the comparator in a power management integrated circuit for energy harvesting in fully battery-less implantable medical devices. The overall performances of the rectifier are shown, giving out a post-layout power conversion efficiency higher than 92.5%.