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

Author

Santi, Stefano ; Rovatti, Riccardo ; Setti, Gianluca

Author_Institution

Dipt. di Elettronica, Inf. e Sistemistica, Bologna Univ., Italy

Volume

4

fYear

2004

fDate

23-26 May 2004

Abstract

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.

Keywords

numerical analysis; pulse amplitude modulation; pulse width modulation; spectral analysis; switching; PSD; PWM signals; PWM spectrum; digital implementation; information modulating signal; numerical simulation; power spectrum density; pulse amplitude modulation; pulse width modulation; sinusoidal modulating signal; spectral aliasing effects; spectrum effects; time-quantized switching instants; Amplitude modulation; Clocks; Digital modulation; Information analysis; Low pass filters; Pulse width modulation; Signal analysis; Signal processing; Signal resolution; Space vector pulse width modulation;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2004. ISCAS '04. Proceedings of the 2004 International Symposium on

Print_ISBN

0-7803-8251-X

Type

conf

DOI

10.1109/ISCAS.2004.1329097

Filename

1329097