Noise coupling path analysis for RF interference caused by LCD noise modulation

Chulsoon Hwang, Sunkyu Kong, Takashi Enomoto, Junji Maeshima, Kenji Araki, David Pommerenke, Jun Fan

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


RF interference caused by liquid crystal display (LCD) noise modulation in a mobile phone was investigated and its noise coupling path was demonstrated. In the frequency division duplex communications, mobile phones can send (uplink) and receive (downlink) at the same time. When an antenna transmits high power signal, the baseband noise from an LCD panel is modulated into an RF band and causes interference in a receiving antenna. A noise coupling path between an antenna and a display driver IC, which drives the LCD panel, was experimentally demonstrate. In addition, a simple noise source model was proposed to represent modulation mechanism. A network analysis with the modulation model showed good correlation with the measured spectra of the modulated noise in a receiving antenna.

Original languageEnglish
Title of host publication2016 IEEE International Symposium on Electromagnetic Compatibility, EMC 2016
PublisherInstitute of Electrical and Electronics Engineers
Number of pages5
ISBN (Electronic)9781509014415
Publication statusPublished - 19 Sept 2016
Externally publishedYes
Event2016 IEEE International Symposium on Electromagnetic Compatibility: EMC 2016 - Ottawa, Canada
Duration: 25 Jul 201629 Jul 2016

Publication series

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


Conference2016 IEEE International Symposium on Electromagnetic Compatibility


  • LCD
  • mobile phone
  • modulation
  • noise coupling
  • RF interference
  • RFI

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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