低功率高増益軌對軌輸入／輸出放大器

機構典藏 > College of Engineering > Graduate Institute & Department of Electrical Engineering > Thesis > Item 987654321/52503

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Title:	低功率高増益軌對軌輸入／輸出放大器
Other Titles:	Low-power operational amplifier with high-gain rail-to-rail input and output ranges
Authors:	方偉憲;Fang, Wei-hsien
Contributors:	淡江大學電機工程學系碩士在職專班郭建宏;Kuo, Chien-hung
Keywords:	低功率;高增益;軌對軌;low-power;High-Gain;Rail-to-Rail
Date:	2010
Issue Date:	2010-09-23 17:51:52 (UTC+8)
Abstract:	在這篇論文裡，我們提了一個低功率高増益軌對軌放大器，定值轉導補償控制電路使用於輸入級在寬廣的操作範圍中，以達到最佳頻寬及穩定響應，沒有共模回授的差動輸入、單端輸出増益提升的放大器可以將功率消耗最小化及增加放大器的 dc 増益，浮動電流源亦引入至疊接級以提供適當的偏壓給 AB 型的輸出級。本論文所提的放大器可掛大電容、或小電阻負載，而不會損耗増益或單増益頻寬。論文中晶片是以 TSMC 0.35 um 2P4M CMOS 製程來實現。在負載為 50 pF時，放大器 dc 増益可達 123dB 及 1.52MHz 的單増益頻率，電壓源為 3.3V 功率消耗為 0.36 mW。 A low-power high-gain CMOS operational amplifier with rail-to-rail input/output ranges is presented in this paper. A constant-gm controller is employed in the input stage to achieve an optimum bandwidth and settling response in a wide operational range. A differential-input single-output gain-boosting amplifier without common-mode feedback is applied to minimize the power consumption and increase the dc gain of opamp. The floating current sources are also introduced to the cascode stage to provide proper bias levels for the class AB output stage. The proposed opamp can load with a large capacitance or a small resistance loads without losing the gain and unity-gain bandwidth. It has been fabricated in a 0.35 μm 2P4M CMOS process. With a 50 pF of the output capacitance load, a 123dB of dc gain and a 1.52MHz of unity-gain frequency can be achieved in the proposed opamp. The total power dissipation is only 0.36 mW at a 3.3 V of supply voltage.
Appears in Collections:	[Graduate Institute & Department of Electrical Engineering] Thesis

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