A CMOS low-power, high-speed, asynchronous comparator for synchronous rectification applications

Author

Levy, G. ; Piovaccari, A.

Author_Institution

Analog Mixed Signal Design Group, Cadence Design Syst., Columbia, MD, USA

Volume

2

fYear

2000

fDate

2000

Firstpage

541

Abstract

A novel approach for the design of an asynchronous comparator implemented in standard digital CMOS technology for power supply applications is presented. The 1 mV sensitivity comparator is designed for asynchronous event detection, featuring a multi-stage topology for power efficiency and minimum propagation delay. It also contains a mixed-mode offset compensation architecture that allows full compensation in a single cycle. The comparator has been successfully used in the design of a very high frequency, 300 mA multi-mode PWM/PSM (Pulse Width Modulation/Pulse Skipping Mode) buck converter. The comparator is able to operate with a supply voltage as low as 2.4 V. Operating with a 3.6 V supply, under typical operating conditions, the comparator features a 19 ns delay consuming 161 μW

Keywords

CMOS integrated circuits; DC-DC power convertors; PWM power convertors; comparators (circuits); compensation; low-power electronics; mixed analogue-digital integrated circuits; power electronics; rectification; 1 mV; 161 muW; 19 ns; 2.4 to 3.6 V; 300 mA; CMOS asynchronous comparator; asynchronous event detection; compensation; high-speed operation; low-power operation; mixed-mode offset compensation architecture; multi-mode PWM/PSM buck converter; multi-stage topology; power supply applications; pulse skipping mode; pulse width modulation; standard digital CMOS technology; synchronous rectification applications; Buck converters; CMOS technology; Event detection; Frequency conversion; Low voltage; Power supplies; Propagation delay; Pulse width modulation; Pulse width modulation converters; Topology;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2000. Proceedings. ISCAS 2000 Geneva. The 2000 IEEE International Symposium on

Conference_Location

Geneva

Print_ISBN

0-7803-5482-6

Type

conf

DOI

10.1109/ISCAS.2000.856385

Filename

856385