Design of a fully differential power output stage for a class D audio amplifier using a single-ended power supply

Pedro V. Leitão, João L. A. de Melo, Nuno Paulino, João L A De Melo

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper presents a full-bridge discrete power output stage for a Class D audio amplifier using a single-ended power supply. The circuit receives a digital control signal with 5 V of amplitude and it generates a floating differential output voltage up to 20 V of amplitude from a single 20 V power supply voltage. Using as control signal a pulse density modulation (PDM) wave generated by an optimized 3rd order continuous-time (CT) sigma delta modulator (ΣΔM), the system achieves a signal-to-noise-plus-distortion ratio (SNDR) of 83.1 dB, total harmonic distortion (THD) of -89 dB and a power efficiency of 92%, while delivering 11 W over an 8-Ω load with a signal bandwidth of 20 kHz and a sampling frequency of 1.28 MHz.

Original languageEnglish
Title of host publicationTechnological Innovation for the Internet of Things
EditorsL. M. Camarinha-Matos, S. Tomic, P. Graca
Place of PublicationBerlin, Heidelberg
PublisherSpringer-Verlag
Pages565-572
Number of pages8
ISBN (Electronic)978-3-642-37291-9
ISBN (Print)978-3-642-37290-2
DOIs
Publication statusPublished - 2013
Event4th IFIP WG 5.5/SOCOLNET Doctoral Conference on Computing, Electrical and Industrial Systems, DoCEIS 2013 - Costa de Caparica, Portugal
Duration: 15 Apr 201317 Apr 2013

Publication series

NameIFIP Advances in Information and Communication Technology
PublisherSpringer Verlag
Volume394
ISSN (Print)1868-4238

Conference

Conference4th IFIP WG 5.5/SOCOLNET Doctoral Conference on Computing, Electrical and Industrial Systems, DoCEIS 2013
CountryPortugal
CityCosta de Caparica
Period15/04/1317/04/13

Keywords

  • Class D Audio Amplifier
  • Gate Driver
  • Output Stage

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