EMI-reduction coding based on 8b/10b

Chiu Chih Chou, Tzong Lin Wu

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

4 Scopus citations

Abstract

The broadband high speed digital signals may affect nearby wireless communication devices and cause significant electromagnetic interference (EMI) problem. Common solutions, such as shielding or layout improvement, usually focus on the coupling path control. This paper presents a new coding method compatible with 8b/10b to reduce EMI at the source. The coding uses the control-symbol K29.7 in 8b/10b to achieve spectrum suppression at specific target frequency. One or two K29.7s may be added into the data stream for every 4 to 10 data-symbols. The arrangement that has the smallest Fourier transform amplitude is selected as the final output signal. At the receiver end, these redundant K29.7s are simply discarded. The normal data transmission is not affected except throughput reduction. The only requirement of this coding scheme is that one specific control-symbol must be reserved for EMI reduction purpose, but not for other control function. It is found experimentally that the amplitude spectrum of a 5-Gbps 8b/10b source may be suppressed at 2.437 GHz by 7 to 12 dB, depending on the specific coding detail, which verifies the effectiveness of the proposed coding method.

Original languageEnglish
Title of host publication2017 IEEE International Symposium on Electromagnetic Compatibility, Signal and Power Integrity, EMCSI 2017 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages373-376
Number of pages4
ISBN (Electronic)9781538622308
DOIs
StatePublished - 20 Oct 2017
Event2017 IEEE International Symposium on Electromagnetic Compatibility, Signal and Power Integrity, EMCSI 2017 - Washington, United States
Duration: 7 Aug 201711 Aug 2017

Publication series

NameIEEE International Symposium on Electromagnetic Compatibility
ISSN (Print)1077-4076
ISSN (Electronic)2158-1118

Conference

Conference2017 IEEE International Symposium on Electromagnetic Compatibility, Signal and Power Integrity, EMCSI 2017
Country/TerritoryUnited States
CityWashington
Period7/08/1711/08/17

Keywords

  • 8b/10b line code
  • Electromagnetic interference

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