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

Morrison, Christopher and Weiss, Stephan and Macleod, Malcolm and Stewart, Robert (2012) Comparison of single- and double-sided pulse width modulated signals with non-linear predistortion. In: 5th European DSP in Education and Research Conference, 2012-09-13 - 2012-09-14.

[img]
Preview
 PDF
morrison12b.pdf
Final Published Version
Download (744kB)| Preview

    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.

    Author(s):Morrison, Christopher, Weiss, Stephan ORCID logoORCID: https://orcid.org/0000-0002-3486-7206, Macleod, Malcolm and Stewart, Robert ORCID logoORCID: https://orcid.org/0000-0002-7779-8597
    Item type:Conference or Workshop Item(Paper)
    ID code:44253
    Keywords:single and double sided pulse width modulated signals, pulse width modulated signals, non-linear predistortion, Electrical engineering. Electronics Nuclear engineering, Electrical and Electronic Engineering
    Subjects:Technology > Electrical engineering. Electronics Nuclear engineering
    Department:Faculty of Engineering > Electronic and Electrical Engineering
    Technology and Innovation Centre > Sensors and Asset Management
    Depositing user: Pure Administrator
    Date deposited:01 Jul 2013 11:14
    Last modified:03 Nov 2019 01:33
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/44253
    Export data:
    CORE (COnnecting REpositories)