Ripple compensation for a class-D amplifier

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dc.contributor.authorCox, Stephen M.en_ZA
dc.contributor.authorMouton, H. du Toiten_ZA
dc.date.accessioned2016-08-22T07:47:29Z
dc.date.available2016-08-22T07:47:29Z
dc.date.issued2015
dc.descriptionCITATION: Cox, S. M. & Mouton, H. 2015. Ripple compensation for a class-D amplifier. SIAM Journal on Applied Mathematics, 75(4):1536–1552, doi:10.1137/140997695.
dc.descriptionThe original publication is available at http://www.siam.org/journals/siap.php
dc.description.abstractENGLISH ABSTRACT: This paper presents the first detailed mathematical analysis of the ripple compensation technique for reducing audio distortion in a class-D amplifier with negative feedback. The amplifier converts a relatively low-frequency audio signal to a high-frequency train of rectangular pulses whose widths are slowly modulated according to the audio signal (pulse-width modulation, PWM). Distortion manifests itself through unwanted audio-frequency harmonics that arise in the output due to nonlinearities inherent in the design. In this paper, we first develop a small-signal model, which describes the fate of small-amplitude perturbations to a constant input, and demonstrate how this traditional engineering tool may be extended to allow one to infer the most significant contributions to the full output in response to a general audio input. We then compute the audio output of the amplifier through a perturbation expansion based on the ratio between audio and switching frequencies. Our results explicitly demonstrate how the ripple compensation technique significantly linearizes the output, thereby reducing the distortion.en_ZA
dc.description.abstractAFRIKAANSE OPSOMMING: Geen opsomming beskikbaaraf_ZA
dc.description.urihttp://epubs.siam.org/doi/abs/10.1137/140997695
dc.description.versionPublisher's version
dc.format.extent17 pagesen_ZA
dc.identifier.citationCox, S. M. & Mouton, H. 2015. Ripple compensation for a class-D amplifier. SIAM Journal on Applied Mathematics, 75(4):1536–1552, doi:10.1137/140997695.
dc.identifier.issn1095-712X (online)
dc.identifier.otherdoi:10.1137/140997695
dc.identifier.urihttp://hdl.handle.net/10019.1/99430
dc.language.isoen_ZAen_ZA
dc.publisherSociety for Industrial and Applied Mathematicsen_ZA
dc.rights.holderSociety for Industrial and Applied Mathematicsen_ZA
dc.subjectClass-D amplifieren_ZA
dc.subjectMathematical modelen_ZA
dc.subjectApostol--Bernoulli functionsen_ZA
dc.subjectElectronic systemsen_ZA
dc.subjectData transmission systemsen_ZA
dc.titleRipple compensation for a class-D amplifieren_ZA
dc.typeArticleen_ZA
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