LCD baseband noise modulation estimation for radio frequency interference in mobile phones

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A method to predict the modulated noise coupling to an antenna is proposed and experimentally validated using a practical mobile phone. The baseband noise of a liquid crystal display (LCD) is modulated with the Tx carrier signal of cellular communication, resulting in a radio frequency desensitization problem. The modulation mechanism is understood and its circuit representation is proposed to estimate the modulated noise coupling to an antenna. The modulation coefficient, which represents a relationship between the coupled voltage and modulated current, is experimentally extracted from a stand-alone LCD panel. The proposed modulation model is successfully validated through comparison with measurements using a practical mobile phone.

Original languageEnglish
Title of host publication2017 Asia-Pacific International Symposium on Electromagnetic Compatibility, APEMC 2017
PublisherInstitute of Electrical and Electronics Engineers
Pages226-228
Number of pages3
ISBN (Electronic)9781538639122
DOIs
Publication statusPublished - 11 Jul 2017
Externally publishedYes
Event2017 Asia-Pacific International Symposium on Electromagnetic Compatibility, APEMC 2017 - Seoul, Korea, Republic of
Duration: 20 Jun 201723 Jun 2017

Publication series

Name2017 Asia-Pacific International Symposium on Electromagnetic Compatibility, APEMC 2017

Conference

Conference2017 Asia-Pacific International Symposium on Electromagnetic Compatibility, APEMC 2017
CountryKorea, Republic of
CitySeoul
Period20/06/1723/06/17

Keywords

  • LCD
  • mobile phone
  • modulation
  • Radio frequency interference
  • RFI

ASJC Scopus subject areas

  • Instrumentation
  • Radiation

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