Digital audio power amplifiers using Sigma Delta Modulation - linearity problems in the class-D power stage

Robert W. Stewart, Gerhard Gruhler, Rolf Esslinger

Research output: Contribution to conferencePaper

Abstract

A completely digital audio power amplifier uses binary (two-level) signals up to the power stage. Often MOSFETs are used as power devices, as they can provide a high output power together with a fast switching speed. The generation of accurate, rectangular pulses in the analogue power amplifier circuit is a problem, especially at pulses with an extremely short duration, as they may come from high resolution Sigma-Delta Modulation. In this paper some of the typical pulse signal waveform distortions introduced by the realistic switching power stage are shown by simple circuit models. Additionally it will be explained, how certain errors can affect the linearity of pulse signals from Sigma-Delta Modulation.
Original languageEnglish
Publication statusPublished - 1 May 2001
Event110th AES Convention - Amsterdam, Netherlands
Duration: 12 May 200115 May 2001

Conference

Conference110th AES Convention
Country/TerritoryNetherlands
CityAmsterdam
Period12/05/0115/05/01

Keywords

  • digital audio power amplifier
  • high output power
  • Sigma-Delta modulation

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