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A micropower low-distortion digital pulsewidth modulator for a digital class D amplifier

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A micropower low-distortion digital pulsewidth modulator for a digital class D amplifier

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Title: A micropower low-distortion digital pulsewidth modulator for a digital class D amplifier
Author: Bah, Hwee Gwee; Chang, Joseph Sylvester; Li, Huiyun
Copyright year: 2002
Abstract: We describe the design of a micropower digital pulsewidth modulator (PWM) for a hearing instrument Class D amplifier. The PWM embodies a novel delta-compensation (έC) sampling process and a novel pulse generator. The C process is sampled at the same low rate as reported algorithmic sampling processes and it features a similar low total harmonic distortion(THD). Its arithmetic computation is however, substantially simplified. We analytically derive the double Fourier series expression for the C process and show that the THD is low. The pulse generator is based on a hybrid 9-b counter 3-b tapped-delay-line. We investigate the compromise between the different design parameters that affect its power dissipation and THD. The complete proposed PWM features a simple circuit implementation (small IC area), micropower low voltage operation ( 22.1 µW@ 1.1 V), low sampling rate (48 kHz) and low harmonic distortion ( 0.2%), thereby rendering it suitable for a practical digital hearing instrument. We verify our design by means of computer simulations and on the basis of experimental measurements.
Subject: DRNTU::Engineering::Electrical and electronic engineering
Type: Journal Article
Series/ Journal Title: IEEE transactions on circuits and systems-II : analog and digital signal processing
School: School of Electrical and Electronic Engineering
Rights: © 2002 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.
Version: Published version

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