Noise Coupling Path Analysis for RF Interference Caused by LCD Noise Modulation
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.
C. Hwang et al., "Noise Coupling Path Analysis for RF Interference Caused by LCD Noise Modulation," Proceedings of the IEEE International Symposium on Electromagnetic Compatibility (2016, Ottawa, Canada), pp. 348-352, Institute of Electrical and Electronics Engineers (IEEE), Sep 2016.
The definitive version is available at https://doi.org/10.1109/ISEMC.2016.7571671
2016 IEEE International Symposium on Electromagnetic Compatibility, EMC 2016 (2016: Jul. 25-29, Ottawa, Canada)
Electrical and Computer Engineering
Center for High Performance Computing Research
Second Research Center/Lab
Electromagnetic Compatibility (EMC) Laboratory
Keywords and Phrases
Antennas; Cellular telephones; Electromagnetic compatibility; Mobile phones; Modulation; Receiving antennas; Regression analysis; Telephone sets; Display driver ic; Frequency-division duplexes; Good correlations; Liquid crystal display(LCD); Modulation models; Noise coupling; Noise source models; RF interference; Liquid crystal displays
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Article - Conference proceedings
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