臺灣博碩士論文加值系統

　　準確的參考電壓源在現今的積體電路系統中扮演相當重要的角色，它能產生一穩定的參考電壓，不因電源電壓及環境溫度的變化而產生太大的變動，以提供系統作為比較或維持電路正常操作之用。參考電壓源的應用相當廣泛，常見用於類比-數位或數位類比轉換器、運算放大器或線性穩壓器中，提供設定輸入或輸出電壓範圍、差動輸入對之電流源偏壓或作為比較器的參考電壓等等。
　　本論文主要目的為設計一可操作在輸入電壓3V-6V而輸出電壓約1.25V的能隙參考電壓產生電路，提供一穩定的參考電壓給低壓降線性穩壓器使用。我們利用前置穩壓電路先將工作電壓降至2V，再供給能隙參考電壓源使用，如此將減小輸出電壓對電源電壓的敏感度。最後將提出一新的電路架構，可得到電源電壓敏感度小於0.3 mV/V且溫度係數約為7 ppm/℃左右的能隙參考電壓源，而其最大必v消耗亦低於100μW。

　　Precision voltage reference plays an important role in modern integrated circuits systems. It can produce a stable reference voltage insensitive to the variations of supply voltage and temperature. Voltage references are widely adopted in many integrated circuits, such as A/D or D/A converters, operational amplifiers, and linear regulators. They are used for defining input/output voltage range, biasing current source of differential pairs, and providing a comparison reference for comparators, etc.
　　The objective of this thesis is to design a bandgap reference voltage generator with input voltage 3V to 6V and output voltage around 1.25V. This reference voltage is intended for using in low dropout linear regulators (LDO). A pre-regulator circuit feeds the bandgap circuit with a regulated 2V to lower the supply voltage sensitivity. A new bandgap circuit topology is also presented. The final bandgap reference with supply voltage sensitivity less than 0.3 mV/V, and temperature coefficient around 7 ppm/℃, and power consumption lower than 100μW is achieved.

第一章 序論 1
１－１ 研究動機 1
１－２ 能隙參考電壓產生電路簡介 2
１－３ 設計流程 3
１－４ 論文內容介紹 5

第二章 能隙參考電壓產生電路設計原理 6
２－１ 基本理論 6
２－２ ＰＴＡＴ與ＰＴＡＴ２參考電流源 10
２－３ 參考電壓源之輸出級 13
２－４ 常見的能隙參考電壓產生電路 15

第三章 能隙參考電壓產生電路之製作 19
３－１ 設計考量與電路架構 19
３－２ 能隙電流源 21
３－３ 能隙電壓源 24
３－４ 啟動電路 28
３－５ 整體電路的模擬與修正 .33

第四章 電路佈局與實測 65
４－１ 初次下線的電路佈局及量測結果 65
４－２ 電阻的誤差 68
４－３ 電流鏡的誤差 71
４－４ ＢＪＴ的誤差 74

第五章 電路架構的再改良 75
５－１ 第一型改良電路 75
５－２ 第二型改良電路 77

第六章 結論與展望 79
６－１ 結論 79
６－２ 未來展望 79

參考文獻 81

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