提出的主要研究為低電壓、低功率放大器，其中一個為寬擺幅、線性轉導的運算轉導放大器，而另外二個電路為高性能的電流運算放大器，所有放大器的供應電壓都低於一個起始電壓加上二個過驅電壓值 (VTH+2VOD)。
在這篇論文中，電路的供應電壓為1V。模擬結果顯示運算轉導放大器有0.7V的線性範圍，轉導為147μA/V，功率消耗是0.133mW。在電流放大器的二個設計電路中，模擬結果顯示COA(1)的電流增益為143，輸入阻抗為110Ω，輸出阻抗是240KΩ以及功率消耗為0.15mW。在COA(2)的模擬結果其電流增益達到110，功率消耗是0.07mW，輸入以及輸出阻抗分別為95Ω和500KΩ。
所有的放大器是利用HSPICE分析研究，並且在TSMC 0.35μm 2p4m CMOS製程下製作完成。

Low voltage, low power amplifiers are proposed. One of the operational amplifiers is an Operational Transconductance Amplifier (OTA) with wide input and output swing and constant gm. The second and third amplifiers are high-performance Current Operational amplifiers (COAs). All amplifiers have power supply as low as one threshold voltage plus two overdrive voltage.
In this thesis, the supply voltage is 1V. Simulation results show that the OTA has the maximum linear range over 0.7V. The transconductance can be 147μA/V, the power consumption is 0.133mW. There are two designs of the COA. Simulation results show COA(1) with a current gain of 143. The input impedance is 110Ω, the output impedance is 240KΩ and the power consumption is 0.15mW. In the simulation results of the COA(2), the current gain is 110. The DC power dissipation is 0.07mW. The input and output impedance are 95Ω and 500KΩ, respectively.
All the proposed amplifiers are implemented on a TSMC 0.35μm 2p4m CMOS process technology and analyzed using HSPICE.

Contents
Abstract

Chapter 1 Introduction
Chapter 2 Low Voltage, Low Power CMOS OTA
2.1 Basic Model of the OTA
2.2 Previous Low Voltage CMOS OTAs
2.2.1 OTA Circuit with Source Cross-Couple Pair
2.2.2 OTA Circuit with Linearized Differential Pair
2.2.3 OTA Circuit with Triode Transistors
2.2.4 Discussions of the Previous Low Voltage CMOS OTAs
2.3 Basic Idea of the Proposed OTA
2.3.1 The Floating Voltage Control Voltage Source Operational Amplifier
2.4 Design of the Low Voltage, Low Power OTA
2.4.1 Basics of the Proposed Fully Differential OTA
2.4.2 Discussions of the Input Range

Chapter 3 Simulation and Experimental Results of the Proposed OTA
3.1 The OTA Simulation Results
3.1.1 Characteristics of the OTA
3.1.2 Simulation Results Discussions
3.2 The OTA Experimental Results
3.2.1 Measured Results
3.2.2 Experimental Results Discussions

Chapter 4 Low Voltage, Low Power CMOS COA
4.1 Basic Model of the COA
4.2 Previous Low Voltage CMOS COAs
4.2.1 COA Circuit with Technique of the Current
Mirror
4.2.2 COA Circuit with Class AB Input Stage


4.2.3 COA Circuit with Passive Resistors
4.2.4 Discussions of the Previous Low Voltage CMOS COAs
4.3 Design of the Low Voltage, Low power COA
4.3.1 Differential-Output of the COA(1) with
Current Mirror
4.3.2 Differential-Output of the COA(2) with
Differential pair

Chapter 5 Simulation and Experimental Results of the Proposed COA
5.1 The COA Simulation Results
5.1.1 Characteristics of the COA(1)
5.1.2 Characteristics of the COA(2)
5.1.3 Simulation Results Discussions
5.2 The COA Experimental Results
5.2.1 Measured Results
5.2.2 Experimental Results Discussions

Conclusions

Reference

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