Investigation of Electromagnetic Noise Coupling in a Board with a Digital-RF Mixed IC by Measurement and Analysis

Kenta TSUKAMOTO  Mizuki IWANAMI  Eiji HANKUI  

Publication
IEICE TRANSACTIONS on Communications   Vol.E98-B   No.7   pp.1182-1187
Publication Date: 2015/07/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E98.B.1182
Type of Manuscript: Special Section PAPER (Special Section on Electromagnetic Compatibility Technology in Conjunction with Main Topics of EMC'14/Tokyo)
Category: 
Keyword: 
noise coupling,  amplitude probability distribution,  I/Q signal,  3-D electromagnetic simulation,  

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Summary: 
In this paper the amplitude probability distribution (APD) measurement method is applied to evaluate noise coupling to an antenna on an evaluation board that uses mixed RF and digital signals of an IC. We analytically investigate noise coupling path to the antenna where the correlation coefficient matches the APD curve of the evaluation board. Moreover, in order to verify the analysis results, the noise coupling path in the board is evaluated by measurements involving In-phase/Quadrature (I/Q) signals as well as electromagnetic simulations. As a result, we demonstrate that APD method is effective in evaluating a degree of noise coupling from an IC to multiple antennas on the board, and confirm that the intensity of noise coupling to each antenna is affected greatly by the board layout patterns.