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The design of an analogue class-D audio amplifier using Z-domain methods
Thesis (MScEng)--Stellenbosch University, 2012
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| Format: | Thesis |
| Language: | en_Za |
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Stellenbosch : Stellenbosch University
2012
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| _version_ | 1867613963765678080 |
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| access_status_str | Open Access |
| author | Kemp, Pieter Stephanus |
| author2 | Mouton, H. du T. |
| author_browse | Kemp, Pieter Stephanus Mouton, H. du T. |
| author_facet | Mouton, H. du T. Kemp, Pieter Stephanus |
| author_sort | Kemp, Pieter Stephanus |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (MScEng)--Stellenbosch University, 2012 |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/20084 |
| institution | Stellenbosch University (South Africa) |
| language | en_Za |
| last_indexed | 2026-06-10T12:44:29.748Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2012 |
| publishDateRange | 2012 |
| publishDateSort | 2012 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/20084 The design of an analogue class-D audio amplifier using Z-domain methods Kemp, Pieter Stephanus Mouton, H. du T. Putzeys, B. Stellenbosch University. Faculty of Engineering. Dept. of Electrical and Electronic Engineering Class-D audio amplifier Pulse-width modulation Discrete-time modelling Dissertations -- Electronic engineering Theses -- Electronic engineering Thesis (MScEng)--Stellenbosch University, 2012 ENGLISH ABSTRACT: The class-D audio power amplifier has found widespread use in both the consumer and professional audio industry for one reason: efficiency. A higher efficiency leads to a smaller and cheaper design, and in the case of mobile devices, a longer battery life. Unfortunately, the basic class-D amplifier has some serious drawbacks. These include high distortion levels, a load dependent frequency response and the potential to radiate EMI. Except for EMI, the aforementioned issues can be mitigated by the proper implementation of global negative feedback. Negative feedback also has the potential to indirectly reduce EMI, since the timing requirements of the output devices can be relaxed. This thesis discusses the design of a clocked analogue controlled pulse-width modulated class-D audio amplifier with global negative feedback. The analogue control loop is converted to the z-domain by modelling the PWM comparator as a sampling operation. A method is implemented that improves clip recovery and ensures stability during over-modulation. Loop gain is shaped to provide a high gain across the audio band, and ripple compensation is implemented to minimize the negative effect of ripple feedback. Experimental results are presented. AFRIKAANSE OPSOMMING: Die klas-D klankversterker geniet wydverspreide gebruik in beide die verbruiker en professionele oudio industrie vir een rede: benuttingsgraad. ’n Hoër benuttingsgraad lei tot ’n kleiner en goedkoper ontwerp, en in die geval van draagbare toestelle, tot langer batterylewe. Ongelukkig het die basiese klas-D klankversterker ernstige tekortkominge, naamlik hoë distorsievlakke, ’n lasafhanklike frekwensierespons en die vermoë om EMI te genereer. Behalwe vir EMI kan hierdie kwessies deur die korrekte toepassing van globale negatiewe terugvoer aangespreek word. Negatiewe terugvoer het ook die potensiaal om EMI indirek te verminder, aangesien die tydvereistes van die skakel stadium verlaag kan word. Hierdie tesis bespreek die ontwerp van ’n geklokte analoog-beheerde pulswydte-modulerende klas-D klankversterker met globale negatiewe terugvoer. Die analoogbeheerlus word omgeskakel na die z-vlak deur die PWM vlakvergelyker as ’n monster operasie te modelleer. ’n Metode word geïmplementeer wat die stabiliteit van die lus verseker tydens oormodulasie. Die lusaanwins word gevorm om ’n hoë aanwins in die oudioband te verseker en riffelkompensasie word geïmplementeer om die negatiewe effek van terugvoerriffel teen te werk. Eksperimentele resultate word voorgelê. 2012-03-12T08:01:38Z 2012-03-30T10:40:58Z 2012-03-12T08:01:38Z 2012-03-30T10:40:58Z 2012-03 Thesis http://hdl.handle.net/10019.1/20084 en_Za Stellenbosch University 126 p. : ill. application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Class-D audio amplifier Pulse-width modulation Discrete-time modelling Dissertations -- Electronic engineering Theses -- Electronic engineering Kemp, Pieter Stephanus The design of an analogue class-D audio amplifier using Z-domain methods |
| title | The design of an analogue class-D audio amplifier using Z-domain methods |
| title_full | The design of an analogue class-D audio amplifier using Z-domain methods |
| title_fullStr | The design of an analogue class-D audio amplifier using Z-domain methods |
| title_full_unstemmed | The design of an analogue class-D audio amplifier using Z-domain methods |
| title_short | The design of an analogue class-D audio amplifier using Z-domain methods |
| title_sort | design of an analogue class d audio amplifier using z domain methods |
| topic | Class-D audio amplifier Pulse-width modulation Discrete-time modelling Dissertations -- Electronic engineering Theses -- Electronic engineering |
| url | http://hdl.handle.net/10019.1/20084 |
| work_keys_str_mv | AT kemppieterstephanus thedesignofananalogueclassdaudioamplifierusingzdomainmethods AT kemppieterstephanus designofananalogueclassdaudioamplifierusingzdomainmethods |