Modeling and Estimation of LCD Noise Modulation for Radio Frequency Interference
A liquid crystal display baseband noise, whose spectrum is much lower than RF bands, is modulated with the carrier signal of cellular communication and interferes with an Rx receiver resulting in a desensitization problem. The modulation phenomenon is modeled with impedance parameters and a modulation coefficient. The coupled noise on the embedded cellular antenna is experimentally validated in both small- and large-frequency offset cases. In addition, to estimate the modulated noise coupling to the antenna earlier in the development process, a numerical simulation method considering the impedance of display drive IC is proposed successfully validated.
C. Hwang et al., "Modeling and Estimation of LCD Noise Modulation for Radio Frequency Interference," IEEE Transactions on Electromagnetic Compatibility, vol. 59, no. 6, pp. 1685-1692, Institute of Electrical and Electronics Engineers (IEEE), Dec 2017.
The definitive version is available at https://doi.org/10.1109/TEMC.2017.2705178
Electrical and Computer Engineering
Electromagnetic Compatibility (EMC) Laboratory
Keywords and Phrases
Liquid Crystal Display (LCD); Mobile Phone; Modulation; Noise Coupling; Radio Frequency (RF) Interference
International Standard Serial Number (ISSN)
Article - Journal
© 2017 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.