| 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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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| 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 |
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| Conference Date | 2009/3/6(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
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| Paper Information | |
| Registration To | Electromagnetic Compatibility (EMCJ) |
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| 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 | |