Spectral aliasing effects of PWM signals with time-quantized switching instants

Stefano Santi, Riccardo Rovatti, Gianluca Setti

Research output: Chapter in Book/Report/Conference proceedingConference contribution

20 Scopus citations


This paper investigates the problem of the spectrum effects that appear in the power spectrum density (PSD) of a digitally implemented Pulse Width Modulated (PWM) signal. We recognize that as the digital implementation forces the switching instants to be time-quantized, an aliasing effect modifies the properties of the original PWM spectrum. Furthermore, we analyze, through analytical tools and numerical simulation, such effects for two typical cases: a sinusoidal modulating signal and Pulse Amplitude Modulated (PAM) carrying a maximum information modulating signal.
Original languageEnglish (US)
Title of host publicationProceedings - IEEE International Symposium on Circuits and Systems
StatePublished - Sep 7 2004
Externally publishedYes


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