NDLI: A Novel Technique for Harmonic Cancellation in Class-D Amplifiers

Content Provider	IEEE Xplore Digital Library
Author	Cartwright, J. Natarajan, S.
Copyright Year	2008
Description	Author affiliation: Tennessee Technol. Univ., Cookeville (Cartwright, J.; Natarajan, S.)
Abstract	Due to their high efficiency, class-D amplifiers have become attractive to the audio-frequency, power amplifier industry. However, they also exhibit high THD due to the harmonics associated with a high frequency modulation signal. The simplest form of counteracting this distortion is the implementation of a LC, low pass filter. Unfortunately, higher order filtering is required for acceptable performance. Simply adding additional LC filters results in a more expensive and less compact design. This paper presents a technique in which the order of the low pass filter is effectively increased through the use of active compensation. The capacitor current is sampled by an ideal current controlled voltage source (CCVS). The output of the CCVS is further amplified and differentiated by a CFA (current feedback amplifier) circuit. The output of the CFA is then fed back to the output of the class-D amplifier for harmonic cancellation. Analytical realizations are presented and verified by simulations in LTSPICE.
Starting Page	37
Ending Page	41
File Size	2566279
Page Count	5
File Format	PDF
ISBN	9781424418060
ISSN	00942898
DOI	10.1109/SSST.2008.4480185
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-03-16
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Power harmonic filters Low pass filters High power amplifiers Frequency modulation Filtering Capacitors Voltage control Feedback amplifiers Feedback circuits Analytical models
Content Type	Text
Resource Type	Article

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