LCD Baseband Noise Modulation Estimation for Radio Frequency Interference in Mobile Phones
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.
Recommended Citation
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
Meeting Name
2017 Asia-Pacific International Symposium on Electromagnetic Compatibility, APEMC 2017 (2017: Jun. 20-23, Seoul, South Korea)
Department(s)
Electrical and Computer Engineering
Research Center/Lab(s)
Electromagnetic Compatibility (EMC) Laboratory
Keywords and Phrases
LCD; Mobile Phone; Modulation; Radio Frequency Interference; RFI
International Standard Book Number (ISBN)
978-153863912-2
Document Type
Article - Conference proceedings
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2017 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.
Publication Date
01 Jun 2017
Comments
This paper is based upon work supported partially by the National Science Foundation under Grant No. IIP-1440110.