請用此 Handle URI 來引用此文件:
http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/49539
標題: | 高速系統構裝最佳眼高之傳輸結構優化設計 Optimization of Transmission Structures for Best Eye-Heights in High-Speed System Packaging |
作者: | Shih-Ya Huang 黃詩雅 |
指導教授: | 吳瑞北 |
關鍵字: | 最佳化,眼高,高速系統,碼際干擾,反射雜訊,串音雜訊,模態分析,微帶線,可撓式扁平排線, Optimization,eye-height,high-speed system,inter-symbol interference,reflection noises,crosstalk noise,modal analysis,microstrip,flexible flat cable (FFC), |
出版年 : | 2016 |
學位: | 博士 |
摘要: | 為因應高速系統中持續上升的傳輸速率,以及有限的佈線空間,本論文著重於最佳化高速系統封裝中的傳輸結構以得最佳眼圖。本論文不但討論了印刷電路板上的微帶線設計,亦深入探討了高速系統中常用的可撓性扁平排線之結構設計。
針對單端傳輸且阻抗不匹配的微帶線系統,本論文首先提出了快速預測不匹配傳輸系統眼高之演算法,並藉此提出特性等高線圖,描述了不同電源內阻與輸出電阻情況下之眼高變化,而量測結果亦驗證了本論文所提出演算法之正確性。利用該特性圖可發現針對最大眼高之最適終端電阻設計情況,是將傳輸線阻抗鬱傳輸端電阻匹配,並使接收端為開路。此外,本論文亦針對具不同的終端電阻的傳輸線系統提出最佳的微帶線結構設計,以改善眼圖表現。 本論文進一步探討耦合微帶線之最佳化結構設計,提出在有限佈線面積下之最佳線寬與線距設計準則,亦探討了不同電源內阻與輸出電阻的情況。為改善眼高,針對輸出端反設計係數大於零的情況,需藉增加線距降低串音雜訊。針對負的輸入與輸出端反射係數,則須藉增加線寬降低其反射雜訊。量測結果顯示,針對本論文所舉出的設計案例中,眼高改善幅度可達38.6 %。 最後,本論文利用模態分析的方式,有效地優化具有多重接地線的可撓式扁平排線結構,等化了存在排線中兩差動模態速度,使單對差動訊號之眼高改善了約 30 %,輻射能量降低約16 dBW。考慮雙對差動訊號,眼高亦有類似的改善。 This dissertation focuses on designing the transmission structures in packaging to optimize the eye-height for high-speed systems, which becomes essential nowadays due to the ever-increasing data rate of signal and the limited layout area in packaging. To tackle the problems, design methodologies for several optimal transmission structures have been proposed to improve the eye-heights of both on board lines, i.e. the microstrip, and off board components, i.e. the flexible flat cable (FFC), in packaging. The structure of single-ended microstrip in a mismatched transmission line system is investigated by using the fast algorithm for predicting the eye height, in which the small errors between predicted and measured eye-heights show the accuracy of the method. The design contour map is also established versus the reflection coefficients at source and load ends of the transmission line systems. With the contour map, the best termination design for the transmission line system can be found in the condition when the impedance of transmission line is equal to the source resistor and the load is open circuit. Furthermore, for the transmission line system with arbitrary terminations at source and load ends, the optimal impedance design for the mircostrip is also proposed. Furthermore, consider two coupled microstrips in a restricted layout area, the design guidelines to optimize the eye-height are given when the transmission line system is with arbitrary terminations. The first guideline is to minimize the crosstalk noise by making the line space larger when the output reflection coefficient is positive. The second one is to make the transmission line impedance match to the output termination by widening the line width when the reflection coefficients are both negative. With the guidelines, the measured results show that the eye-height can be improved by 38.6 % at most in the performed cases. Finally, optimal design is rendered for the flexible flat cable (FFC) to eliminate the ringing noise and decrease the crosstalk noise by equalizing the modal velocities of the differential modes in FFC. With proposed design for the FFC, the eye-height improves about 30% compared to original design, and the radiation power decreases about 16 dBW. Similar improvement has been noticed even for the case of two pairs of differential signals. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/49539 |
DOI: | 10.6342/NTU201602693 |
全文授權: | 有償授權 |
顯示於系所單位: | 電信工程學研究所 |
文件中的檔案:
檔案 | 大小 | 格式 | |
---|---|---|---|
ntu-105-1.pdf 目前未授權公開取用 | 6.2 MB | Adobe PDF |
系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。