Short-term optimized spread spectrum clock generator for EMI reduction in switching DC/DC converters

Fabio Pareschi, Gianluca Setti, Riccardo Rovatti, Giovanni Frattini

Research output: Contribution to journalArticlepeer-review

30 Scopus citations


We present here a prototype of a Spread Spectrum Clock Generator designed for switching DC/DC converters, which has been optimized in accordance to EMC international regulations to improve EMI reduction with respect to standard approaches. Such an optimization has been obtained trough the theoretical computation of the power spectrum as measured by a spectrum analyzer when a chaotic or random-like PAM modulating signal is employed. To experimentally validate the achieved theoretical results, the circuit has been fabricated in CMOS 0.18 μm technology, and embeds two simple and effective modulators, the first one relying on a full analog hardware, the second one on a simple digital core. Measurements on a DC/DC converter in accordance with EMC regulations confirm that the prototype can achieve a 7 dB EMI reduction improvement with respect to classical solutions based on out of audible triangular waveforms.
Original languageEnglish (US)
Pages (from-to)3044-3053
Number of pages10
JournalIEEE Transactions on Circuits and Systems I: Regular Papers
Issue number10
StatePublished - Oct 1 2014
Externally publishedYes

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Generated from Scopus record by KAUST IRTS on 2023-02-15


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