具多組高速差動訊號對之模組插座連接器之設計

在高速數位電路中，差動傳輸已經有逐漸取代單端訊號傳遞高頻訊號的趨勢。本論文主要是研究具多組差動訊號對在高速互連的模組插座連接器上平衡串音雜訊的抑制。而在模組插座連接器中，網路線插頭和網路線插座前端八根彎曲的導體（插入物）是非雙絞導線的部份，這將導致在鄰近的差動對之間產生嚴重的串音雜訊，因此減少此區域所造成的近端串音是互連設計中相當關鍵的部份。　　針對模組插座連接器，利用高頻量測的方法粹取單端電路的散射參數，然後求出單端金屬線對之間所需平衡補償互容之大小，並且透過在印刷電路板上埋入所需的補償電容，來降低由插頭與插入物非雙絞導線部份所導致的近端串音雜訊。經由補償後模組插座連接器，觀察其頻域串音響應可以明顯地降低並且符合規範之要求；並藉由軟體模擬，將頻域量測結果轉換至時域眼圖，而觀察到模組插座連接器補償前後眼圖的變化情形，亦有明顯的改善。

關鍵字

Cat 6 ；模組插座連接器；差動傳輸對；近端串音雜訊；訊號完整性

並列摘要

Differential transmission may gradually replace trace as the media transmitting high-speed signal on high-speed digital circuit. This dissertation investigates the suppress of balance crosstalk noise in high-speed multi-differentials pair modular jack for high-speed interconnection. In the modular jack connector, the plug and the insert have untwisted wiring regions, which result in significant crosstalk noise between nearby pairs. Hence, reducing the near-end crosstalk noise (NEXT) caused by the region of these is the most crucial part of the interconnection design. 　　The single-ended S-parameters of a modular jack connector was extracted by using high frequency measurements. Then the balancing capacitors between single-ended wire pairs can be calculated and embedded on the PCB for reducing the crosstalk noise caused by the plug and the insert. After the compensation of balancing capacitors in the modular jack connector, the crosstalk in frequency domain is clearly reduced and satisfies the standard requirement. By using the software simulation, the measurement results in frequency domain can be transformed into the time domain eye diagram. To observe the change before and after compensation of modular jack connector, it shows obviously out perform of the eye diagram.

並列關鍵字

Cat 6 ； Modular jack connector ； Differential signal ； Signal integrity

參考文獻

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[3]　T. Kasuga, H. Inoue, “A study on suppression of crosstalk between parallel transmission lines at high frequency band,” in Proc. IEEE International Symposium Electromagnetic. EMC., pp. 1-6, Jul. 2007.

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具多組高速差動訊號對之模組插座連接器之設計

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