Presentation	2013-07-11 A Study on Transformed Common-mode from Differential-mode for Differential Transmission Line with components Ayumi MOTHASHI, Fujiyuki NAKAMOTO, Yuichi SASAKI, Naoto OKA, Hideyuki OHASHI,
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Abstract(in English)	Recently, the high-speed differential interface such as Ethernet is widely used as a line-structure with low radiated noise and high noise immunity. Though high structural balance is usually required to improve these performances, degradation of the balance may often occur from asymmetry of the structure. In that case, some of differential-mode signal is transformed to common-mode, which may often causes increase of radiated noise from the differential transmission line. It is therefore important to reduce the ratio of transformed common-mode to differential-mode (S_) in the design stage to suppress the radiated noise. In this paper, the capacitance model is used for modeling of components. In calculation, S_ can be expressed as difference between capacities connected with each differential transmission line. Calculation and measurement results of S_ are shown. The results showed good agreement, and would be applicable in EMC design of differential transmission lines.
Keyword(in Japanese)	(See Japanese page)
Keyword(in English)	EMC / EMI / PCB / differential transmission line / mode transformation / radiated noise suppression / mixed mode S-parameters / capacitance model
Paper #	EMCJ2013-33
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Conference Information
Committee	EMCJ
Conference Date	2013/7/4(1days)
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Paper Information
Registration To	Electromagnetic Compatibility (EMCJ)
Language	JPN
Title (in Japanese)	(See Japanese page)
Sub Title (in Japanese)	(See Japanese page)
Title (in English)	A Study on Transformed Common-mode from Differential-mode for Differential Transmission Line with components
Sub Title (in English)
Keyword(1)	EMC
Keyword(2)	EMI
Keyword(3)	PCB
Keyword(4)	differential transmission line
Keyword(5)	mode transformation
Keyword(6)	radiated noise suppression
Keyword(7)	mixed mode S-parameters
Keyword(8)	capacitance model
1st Author's Name	Ayumi MOTHASHI
1st Author's Affiliation	Mitsubishi Electric Corporation()
2nd Author's Name	Fujiyuki NAKAMOTO
2nd Author's Affiliation	Mitsubishi Electric Corporation
3rd Author's Name	Yuichi SASAKI
3rd Author's Affiliation	Mitsubishi Electric Corporation
4th Author's Name	Naoto OKA
4th Author's Affiliation	Mitsubishi Electric Corporation
5th Author's Name	Hideyuki OHASHI
5th Author's Affiliation	Mitsubishi Electric Corporation
Date	2013-07-11
Paper #	EMCJ2013-33
Volume (vol)	vol.113
Number (no)	122
Page	pp.pp.-
#Pages	5
Date of Issue