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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.

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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.

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: 19 Apr 2019 03:01
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URI: https://strathprints.strath.ac.uk/id/eprint/44253
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