Presentation 2009-03-13
Estimation of RF Current of LCD Driver IC by Magnetic Near Field Measurement
Shoichi KOBAYASHI, Hideki TORIZUKA, Masahiro YAMAGUCHI,
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Abstract(in English) We measured RF magnetic near field of analogue power lines for a source driver chip used in liquid crystal-TV display panel after the TV set was opened. The analogue power line was identified as the major source of RF magnetic field noise. A planar shielded loop coil was used to measure the induced voltage waveform. Then RF current waveform was obtained from the voltage waveform by time integration based on the Faraday's low. The estimated waveform was a pulse with peak current of 90mA, time width of 1μs, and corresponding electric charge of 139nC. Supposing the obtained current charges the liquid crystal cells, it is in the same order as the charge of 323nC calculated by designed value. A guideline of EMC co-design can be obtained in future by comparing the measured and the simulated current waveforms.
Keyword(in Japanese) (See Japanese page)
Keyword(in English) LCD driver IC / magnetic near filed / shielded loop coil / power supply current / current waveform / EMI
Paper # EMCJ2008-119
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Conference Information
Committee EMCJ
Conference Date 2009/3/6(1days)
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Paper Information
Registration To Electromagnetic Compatibility (EMCJ)
Language JPN
Title (in Japanese) (See Japanese page)
Sub Title (in Japanese) (See Japanese page)
Title (in English) Estimation of RF Current of LCD Driver IC by Magnetic Near Field Measurement
Sub Title (in English)
Keyword(1) LCD driver IC
Keyword(2) magnetic near filed
Keyword(3) shielded loop coil
Keyword(4) power supply current
Keyword(5) current waveform
Keyword(6) EMI
1st Author's Name Shoichi KOBAYASHI
1st Author's Affiliation Graduate School of Engineering, Tohoku University()
2nd Author's Name Hideki TORIZUKA
2nd Author's Affiliation Graduate School of Engineering, Tohoku University
3rd Author's Name Masahiro YAMAGUCHI
3rd Author's Affiliation Graduate School of Engineering, Tohoku University
Date 2009-03-13
Paper # EMCJ2008-119
Volume (vol) vol.108
Number (no) 482
Page pp.pp.-
#Pages 6
Date of Issue