NDLI: THD of Closed-Loop Analog PWM Class-D Amplifiers

Content Provider	IEEE Xplore Digital Library
Author	Wei Shu Chang, J.S.
Copyright Year	2004
Abstract	This paper presents an analytical modeling of the mechanisms of total harmonic distortion (THD) of second-order based single-feedback and double-feedback class-D amplifiers (CDAs). We show that the overall THD in these closed-loop CDAs comprises the THD of their open-loop counterparts reduced by the Loop Gain+1 and the THD due to the combined phase and duty cycle error that is due to feedback, hence unique to closed-loop CDAs. We show that the latter THD can be large and is the dominant THD at high input frequencies ( > 3 kHz), and that the mechanisms therein are the phase and duty cycle errors. By means of double Fourier series analysis, analytical expressions for the harmonic components and thereafter a THD expression for closed-loop CDAs are derived. The derived expressions depict the parameters that affect THD, and are insightful to designers to optimize/vary pertinent parameters to reduce THD. The derived THD expression is verified against HSPICE and on the basis of measurements on a prototype CDA IC and other CDAs realized discretely.
Sponsorship	IEEE Circuits and Systems Society
Starting Page	1769
Ending Page	1777
Page Count	9
File Size	844879
File Format	PDF
ISSN	15498328
Volume Number	55
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-07-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Pulse width modulation Harmonic analysis Total harmonic distortion Power supplies Feedback loop Space vector pulse width modulation Signal to noise ratio Analytical models Frequency Fourier series total harmonic distortion (THD) Class-D amplifier (CDA) duty cycle error phase error Class D amplifier Total Harmonic Distortion
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Hardware and Architecture

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