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Title: | 發光二極體之窄脈衝電流驅動電路設計與實作 Design and Implementation of Narrow Current Pulse Driver of LEDs |
Authors: | Yu-Chen Liu 劉宥辰 |
Advisor: | 陳秋麟(Chern-Lin Chen) |
Keyword: | 發光二極體,窄脈衝電流驅動,寄生電感,高壓驅動,源極切換,電流鏡, LED (light emitting diode),narrow current pulse,parasitic inductance,high voltage driving,source switching,current mirror, |
Publication Year : | 2013 |
Degree: | 碩士 |
Abstract: | 本論文旨在探討驅動發光二極體的窄脈衝電流電路。發光二極體與雷射二極體都是適合用窄脈衝電流驅動的光源,然而發光二極體因發光亮度的持續成長、成本的持續下降,以及對使用者較為安全等原因,在感測、訊號傳送等需要窄脈衝電流驅動以發出短暫強光的應用中,漸漸受到重視與研究。窄脈衝電路亦能用來協助發光二極體的性質測試工作。
從文獻的回顧與分析中,本論文歸納了實作窄脈衝電流電路時應注意的要點─ 降低寄生電感、使用高壓驅動等,以及常見的三大類驅動架構。而後本論文提出以源極切換的概念,改善高電流增益電流鏡架構常見的切換速度較慢的問題,保留其低耗能、可積體化的優點,更因為以低耐壓製程開關驅動高耐壓製程電晶體,降低開關驅動電路的負擔與耗損。經由電路學分析以及模擬測試,確認了源極切換電流鏡作為窄脈衝電流電路的可行性。最後另設計一簡單的環形振盪器測試系統,和源極切換電流鏡一起實際下線,進行實驗量測並討論量測結果。 This thesis focuses on narrow current pulse driver of LEDs (light emitting diodes). Both LEDs and laser diodes are suitable for pulsed drive, but LEDs are gaining more attention and study recently due to continuing growth of light output, declining cost, and safety concern for users. Narrow pulse drive is used for producing strong light with short duration, which founds applications in sensing, communication, etc. Narrow pulse drive is also used in characterization and testing of LEDs. The literature review in this thesis indicates that, in order to obtain narrow current pulse, parasitic inductances on main current loops should be reduced as much as possible, and high voltage driving facilitates rising of current. The review also classifies narrow pulse drivers found in the literature into three types. Among them, current mirror driver with high current gain has advantages of lower power consumption and being ready to be integrated, but its switching speed is usually lower. Source switching technique is then discussed and applied to current mirror driver to improve its switching speed. Source switching technique also relieves the loading and power usage of gate driver, as long as a high voltage transistor is stacked properly onto a low voltage transistor, which switches high voltage one at the source node. Analysis by circuit theory and simulation by HSPICE show that source-switching current mirror driver is feasible to deliver narrow current pulse to LEDs. Finally, a testing system with a ring oscillator is designed and taped out along with a driver. Experiment is then conducted and the result is discussed. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/62426 |
Fulltext Rights: | 有償授權 |
Appears in Collections: | 電子工程學研究所 |
Files in This Item:
File | Size | Format | |
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ntu-102-1.pdf Restricted Access | 6.59 MB | Adobe PDF |
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