Comparison of single- and double-sided pulse width modulated signals with non-linear predistortion

Christopher Morrison, Stephan Weiss, Malcolm Macleod, Robert Stewart

Research output: Contribution to conferencePaper

6 Citations (Scopus)
508 Downloads (Pure)

Abstract

Class D amplifiers are based on a low-bit pulse width modulated (PWM) signal reconstructed through the lowpass characteristic of the loudspeaker. To create a PWM signal, a non-linear conversion from a standard pulse code modulated (PCM) signal has to be performed. The non-linear distortion created in this conversion process can be minimised by non-linear predistortion based on a Wiener-Hammerstein system. In this paper, we compare single and double-sided PWM conversion, whereby the former exhibits a higher resolution but also higher non-linearity compared to the latter. The trade-off between both approaches in creating a highly linear high performance class D audio amplifier is demonstrated by means of simulations and an implementation.
Original languageEnglish
Pages271-275
Number of pages5
DOIs
Publication statusPublished - 13 Sep 2012
Event5th European DSP in Education and Research Conference - Amsterdam, Netherlands
Duration: 13 Sep 201214 Sep 2012

Conference

Conference5th European DSP in Education and Research Conference
CountryNetherlands
CityAmsterdam
Period13/09/1214/09/12

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Keywords

  • single and double sided pulse width modulated signals
  • pulse width modulated signals
  • non-linear predistortion

Cite this

Morrison, C., Weiss, S., Macleod, M., & Stewart, R. (2012). Comparison of single- and double-sided pulse width modulated signals with non-linear predistortion. 271-275. Paper presented at 5th European DSP in Education and Research Conference, Amsterdam, Netherlands. https://doi.org/10.1109/EDERC.2012.6532270