LCD Baseband Noise Modulation Estimation for Radio Frequency Interference in Mobile Phones
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.
C. Hwang et al., "LCD Baseband Noise Modulation Estimation for Radio Frequency Interference in Mobile Phones," Proceedings of the 2017 Asia-Pacific International Symposium on Electromagnetic Compatibility (2017, Seoul, South Korea), pp. 226-228, Institute of Electrical and Electronics Engineers (IEEE), Jun 2017.
The definitive version is available at https://doi.org/10.1109/APEMC.2017.7975467
2017 Asia-Pacific International Symposium on Electromagnetic Compatibility, APEMC 2017 (2017: Jun. 20-23, Seoul, South Korea)
Electrical and Computer Engineering
Electromagnetic Compatibility (EMC) Laboratory
Keywords and Phrases
LCD; Mobile Phone; Modulation; Radio Frequency Interference; RFI
International Standard Book Number (ISBN)
Article - Conference proceedings
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