dc.contributor.author García Tormo, Albert dc.contributor.author Poveda López, Alberto dc.contributor.author Alarcón Gallo, Eduardo dc.contributor.author Guinjoan Gispert, Francisco dc.contributor.other Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica dc.date.accessioned 2013-07-26T17:07:30Z dc.date.created 2013-06 dc.date.issued 2013-06 dc.identifier.citation Garcia, A. [et al.]. A study on multi-level PWM and asynchronous Sigma Delta modulations for enhanced bandlimited signal tracking in switching power amplifiers. "IEEE transactions on circuits and systems I: regular papers", Juny 2013, vol. 60, núm. 6, p. 1621-1634. dc.identifier.issn 1057-7122 dc.identifier.uri http://hdl.handle.net/2117/20014 dc.description.abstract This work deals with multi-level switching amplifiers, in the context of high-efficiency power amplification for signal tracking applications. In particular, this paper evaluates the reduction in the error signal's power due to multi-level power amplification (compared to conventional two-level amplifiers) and compares the performance of two multi-level pulse modulations: PWM and Asynchronous ${{Sigma}} {{Delta}}$ Modulation. First the intrinsic bandwidth limits of multi-level switching amplifiers are inferred, to clearly state the advantages and limitations of multi-level power amplification. From the existing analyses of Pulse Width Modulation already reported in the literature, PWM is herein extended to multiple levels based on an equivalent representation, which allows to derive a closed expression for the power spectrum of multi-level PWM in bandlimited signal tracking. The Asynchronous ${{Sigma}} {{Delta}}$ Modulation is extended to multiple levels and the resulting multi-level encoding algorithm is analyzed in both time and frequency domains. The performance of both modulations is characterized and compared at different operating frequencies and using different number of levels. The main outcomes of this in-depth characterization show that, if the switching frequency is high enough, the tracking error is independent of the modulation and the switching frequency, i.e., it only depends upon the number of levels, which points out the suitability of asynchronous modulations for relatively low switching frequencies (compared to the number of levels). dc.format.extent 14 p. dc.language.iso eng dc.rights Attribution-NonCommercial-NoDerivs 3.0 Spain dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/3.0/es/ dc.subject Àrees temàtiques de la UPC::Enginyeria electrònica::Electrònica de potència dc.subject.lcsh Power amplifiers dc.subject.other Encoding dc.subject.other multi-level modulation dc.subject.other multi-level PWM dc.subject.other multi-level time encoding dc.subject.other power amplifiers dc.subject.other signal analysis dc.title A study on multi-level PWM and asynchronous Sigma Delta modulations for enhanced bandlimited signal tracking in switching power amplifiers dc.type Article dc.subject.lemac Amplificadors de potència dc.contributor.group Universitat Politècnica de Catalunya. EPIC - Energy Processing and Integrated Circuits dc.contributor.group Universitat Politècnica de Catalunya. SEPIC - Sistemes Electrònics de Potència i de Control dc.identifier.doi 10.1109/TCSI.2012.2220463 dc.description.peerreviewed Peer Reviewed dc.relation.publisherversion http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=6497669&queryText%3DA+Study+on+Multi-Level+PWM+and+Asynchronous+Sigma+Delta+Modulations+for+Enhanced+Bandlimited+Signal+Tracking+in+Switching+Power+Amplifiers dc.rights.access Restricted access - publisher's policy local.identifier.drac 12672913 dc.description.version Postprint (published version) dc.date.lift 10000-01-01 local.citation.author Garcia, A.; Poveda, A.; Alarcon, E.; Guinjoan, F. local.citation.publicationName IEEE transactions on circuits and systems I: regular papers local.citation.volume 60 local.citation.number 6 local.citation.startingPage 1621 local.citation.endingPage 1634
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