NDLI: A Novel Technique to Suppress Harmonic Distortion in Class-D Amplifiers

Content Provider	IEEE Xplore Digital Library
Author	Natarajan, S. O'Neal, B.
Copyright Year	2006
Description	Author affiliation: Dept. of Electr. & Comput. Eng., Tennessee Technol. Univ., Cookeville, TN (Natarajan, S.; O'Neal, B.)
Abstract	Class-D amplifiers have become very popular for audio-frequency power amplifiers. Their efficiency makes them attractive for high power or battery operated applications. The disadvantages of class-D amplifiers are almost all related to the undesirable high frequency harmonics caused by the modulation process. Passive LC filters are typically used to reduce these high frequency distortions. Higher order types of these filters require many bulky and expensive inductors. In this paper, the effective order for the class-D output restoration filter is effectively increased by adding a feedforward network to reduce the unwanted high frequency harmonics in the amplifier's load. A class-AB current source in the feedforward path counteracts the high frequency carrier and its associated sidebands. Initially, an analytical solution is developed and then implemented with discrete component models in SPICE. A frequency domain analysis is presented for the feedforward compensation technique as well as optimization by parametric variation. SPICE simulations verify the performance of the system by demonstrating the reduction of total harmonic distortion
Starting Page	127
Ending Page	131
File Size	1494542
Page Count	5
File Format	PDF
ISBN	0780394577
DOI	10.1109/SSST.2006.1619057
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-03-05
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Harmonic distortion Active filters Band pass filters Power harmonic filters Transfer functions Attenuation Frequency modulation USA Councils Equations Filtering theory
Content Type	Text
Resource Type	Article

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