Practical optimization of EMI reduction in spread spectrum clock generators with application to switching DC/DC converters

Fabio Pareschi, Gianluca Setti, Riccardo Rovatti, Giovanni Frattini

Research output: Contribution to journalArticlepeer-review

59 Scopus citations

Abstract

We here consider the most common technique used in spread spectrum clock generators that is the frequency modulation of a timing signal by means of a triangularly shaped waveform. As a first step, we develop a reliable mathematical model of a spectrum analyzer, which allows us to compute the power spectrum as measured by this instrument for any signal put at its input. This is particularly important when considering spread spectrum clocking methods for electromagnetic interference reduction, since international regulations impose constraints on the peak of the spectrum of interfering signals as measured by this instrument. Thanks to the developed mathematical tool, we are able to theoretically prove that the maximum peak reduction of the measured spectrum is achieved for a well-defined frequency of the triangular driving signal. This is in contrast with what one can obtain by optimizing the theoretical power density spectrum, where the minimum interference is ideally obtained when the triangular signal has a vanishing frequency. The results are confirmed by measurements on two commercial dc/dc switching converters. © 2013 IEEE.
Original languageEnglish (US)
Pages (from-to)4646-4657
Number of pages12
JournalIEEE Transactions on Power Electronics
Volume29
Issue number9
DOIs
StatePublished - Jan 1 2014
Externally publishedYes

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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