利用高阻抗不匹配改善損耗線之眼圖

Abstract

本文主要是針對阻抗不匹配反射來改善眼圖作探討。信號在高速傳輸時，主要的損耗是來自傳輸線隨頻率增高所帶來的高損耗，為了避免因嚴重的損耗而使電壓波型失真，甚至造成邏輯位準的誤判而使電路誤動作，所以就利用高阻抗元件所產生的反射量疊加來改善接收端的波型信號完整度。 此外，吾人以電感和高阻抗傳輸線長做為高阻抗元件，並對其做了詳盡探討和分析，依據其反射量疊加原理推導出一套準確的補償方法。當吾人只要知道傳輸線的損耗時，就可快速且準確地知道欲加入的補償元件，這樣不僅可大幅改善信號的完整度，也可節省模擬與設計的時間。

The thesis focuses on eye diagram improvement using reflections caused by impedance mismatch for lossy lines. When signal transmits at high speed, the loss that comes from the transmission line increases. In order to avoid the resultant voltage waveform distortion the misjudgment of digital signal, and even system failure, utilizes the superposition of reflection by high impedance line to improve the signal integrity of the wave form at receiver. In addition, this study utilizes an inductor or a high impedance line as the high impedance component and investigates its performance. A set of design rule has been derived for inductance value and length of high impedance transmission line. Given the frequency dependence of the transmission line loss, one can find out accurately the desired compensation. This may not only improve the signal integrity, but also save the time of simulation and design.