Picture of neon light reading 'Open'

Discover open research at Strathprints as part of International Open Access Week!

23-29 October 2017 is International Open Access Week. The Strathprints institutional repository is a digital archive of Open Access research outputs, all produced by University of Strathclyde researchers.

Explore recent world leading Open Access research content this Open Access Week from across Strathclyde's many research active faculties: Engineering, Science, Humanities, Arts & Social Sciences and Strathclyde Business School.

Explore all Strathclyde Open Access research outputs...

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.

morrison12b.pdf - Final Published Version

Download (744kB) | Preview


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.