高功率LED的電流源驅動模組

Current Mirror Driver For High Power LED Backlight Module

王麒榕(Chi-Zong Wang)

指導教授 ： 黃惠良 ； 黃忠民

國立清華大學/電機資訊學院/積體電路設計產業研發碩士專班/碩士(2007年)

https://doi.org/10.6843/NTHU.2007.00131

摘要

本篇論文是介紹不受溫度影響的偏流電路。以傳統的參考臨界電壓電路結合對溫度補償電阻的特性設計出，此電路可以在輸入電壓超過1.5V時正確的工作與啟動。如此，得到一個不隨工作電壓與環境溫度變化的參考電流源將會達成。

另外，本篇論文亦介紹一種穩定式負回授疊加電流鏡，此種電流鏡是利用電壓水準位移的方法達到穩定輸出的結果，此電流鏡由以下三種特性組成：高精準電流複製電路、穩定的高輸出阻抗及寬廣的輸入電壓擺幅。

關鍵字

電流鏡 ； 偏流電路 ； 半導體能隙

並列摘要

Abstract

A novel implementation of temperature independent current reference is proposed in this thesis. Based on the traditional bandgap circuit, a current reference is realized by compensating the temperature performance of the resistor, which can start correctly and work properly with a power supply voltage above 1.5V. Thus, a current reference independent and power supply voltage variations is proposed.

A regulated feedback cascode current mirror is also proposed in this thesis. The current mirror is composed of the following three parts: the high accurate current matching circuit, the regulated high output resistance circuit and the wide voltage swing input circuit.

並列關鍵字

current mirror ； bias current ； bandgap

參考文獻

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