非等长差模传输线之讯号完整度分析-国立彰化师范大学.PDF

工業教育與技術學刊 第三十二期 民國九十六年 第 245～256 頁 Journal of Industrial Education and Technology Vol. 32. December. 2007, PP. 245 ～256 非等長差模傳輸線之訊號完整度分析 吳明皇 * 陳文中 ** *景文科技大學 電子工程學系 講師 **國立彰化師範大學 工業教育與技術學系 助理教授 摘 要 由於數位電路的快速發展及時脈的不斷提升，電磁干擾的現象愈來愈受到重視。差 模傳輸的電磁干擾現象比共模傳輸小，所以很多高速傳輸已經漸漸地改用差模的方式來 傳輸。在差模傳輸中，一個訊號需要用到兩條相位完全相反訊號線來傳輸，然而在某些 情況下這兩條線訊號沒有完全同步地相位相反，那麼就會產生共模的干擾訊號，當干擾 提升時，甚至會影響訊號的完整度。本文的主要目的是在探討非等長的差模傳輸線所產 生的相位問題及對於訊號完整度的影響。 關鍵詞：差模、訊號完整、電磁干擾、串音、傳輸線 三十二期 工業教育與技術學刊 245 Journal of Industrial Education and Technology Vol. 32. December. 2007, PP. 245 ～256 Analysis of the Signal Integrity for Unfixed-Length Differential Mode Line Ming-Huang Wu*, Wen-Jong Chen** *Department of Electronic Engineering, Jin Wen University of Science **Department of Industrial Education and Technology, National Changhua University of Education Abstract As the digital circuits improved speedly and the pulses developed continuously, the electromagnetic interference (EMI) phenomenon is becoming increasingly popular. The EMI of the differential mode line is smaller than that of the common mode line so that many high speed circuits have been gradually utilizing the differential mode. In the differential mode line, a signal needs to adopt two transmission lines of the diametrically opposed phase, but the signals of these lines don’t have complete synchronization out of phase under same conditions. Accordingly, the interference signals of the