Paper Abstract and Keywords |
Presentation |
2015-11-13 13:00
Unbalance Compensation of Differential Transmission Lines with Lightning Protection Devices on PCB Ayumi Motohashi, Fujiyuki Nakamoto, Yuichi Sasaki, Naoto Oka, Hideyuki Oh-hashi (Mitsubishi Electric Corp.) EMCJ2015-84 |
Abstract |
(in Japanese) |
(See Japanese page) |
(in English) |
Recently, differential transmission lines which have low electromagnetic radiation performance are widely used for high speed digital interconnections. Though high electrical balance is required to obtain that performance, degradation of the electrical balance may often occur from asymmetry of the line structure, such as additional patterns and electrical components connected to one or both of the single lines of differential transmission lines. In that case, some part of differential-mode signal is converted to common-mode signal, which may often increase electromagnetic radiation from the differential transmission line. It is therefore important to reduce the differential mode to common mode conversion ratio by keeping the electrical balance. We verified that the additionally connected patterns and components such as lightning protection circuits could be modeled with a shunt capacitor connected between the single line and the ground.
In this paper, we measured the differential mode to common mode conversion ratio of the differential transmission lines with lightning protection devices on printed circuit board. We propose the method of the unbalance compensation by minimizing the difference in the capacitance between each single line of the differential transmission lines. |
Keyword |
(in Japanese) |
(See Japanese page) |
(in English) |
EMC / EMI / PCB / differential transmission line / mixed mode S-parameters / mode transformation / radiated noise suppression / |
Reference Info. |
IEICE Tech. Rep., vol. 115, no. 309, EMCJ2015-84, pp. 19-23, Nov. 2015. |
Paper # |
EMCJ2015-84 |
Date of Issue |
2015-11-06 (EMCJ) |
ISSN |
Print edition: ISSN 0913-5685 Online edition: ISSN 2432-6380 |
Copyright and reproduction |
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EMCJ2015-84 |
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