高度線性和寬擺幅特性的運算轉導放大器是類比電路設計的焦點，這篇論文我們研究的重點是低失真、寬擺幅的運算轉導放大器。
電路的操作電壓是5V，模擬結果証明我們提出的運算轉導放大器具有線性、可調和寬擺幅的特性。運算轉導放大器最大的線性範圍是5V，轉導值的調整範圍可以從 23μA/V到37μA/V，當輸入訊號是3VPP和1MHz，總諧波失真為51dB。
運算轉導放大器用來實現1-MHz七階巴特渥斯低通濾波器，當輸入訊號是1VPP和100KHz，總諧波失真為50dB。所有的電路設計均以UMC 0.5μm 2p2m製程技術來實現。

Operational Transconductance Amplifiers (OTAs) with high linearity and wide input range characteristics have become a focus of interest for analog continuous-time circuits. In this research, we intend to develop a low distortion, wide swing CMOS OTA.
The supply voltage is 5V. Simulation results show that the OTA is linear, tunable and wide swing. The transconductance can be tuned from 23μA/V to 37μA/V. When a 3VPP input signal with 1MHz is applied, THD of the OTA is 51dB.
The OTA is used to realize a 1-MHz 7th-order Butterworth lowpass filter. When a 1VPP input signal with 100KHz is applied, THD of the lowpass filter is 50dB. All the circuits are designed based on the UMC 0.5μm 2p2m CMOS process technology.

Abstract

Chapter 1 Introduction
1.1 Basic Concept and Idea
1.2 Thesis Organization

Chapter 2 Previous Wide Swing CMOS OTA
2.1 Basic Model of the OTA
2.2 OTA Circuit with Source Cross-Coupled Pair
2.2.1 Basic Theorem
2.2.2 Linearity Considerations
2.3 OTA Circuit with Passive Resistor
2.3.1 Basic Theorem
2.3.2 Linearity Considerations
2.4 OTA Circuit with Triode Transistors
2.4.1 Basic Theorem
2.4.2 Linearity Considerations
2.5 Discussions of the Previous Wide Swing CMOS OTA

Chapter 3 Design of the Low Distortion, Wide Swing CMOS OTA
and its Application in Filter
3.1 The Proposed OTA
3.1.1 Basics of the Proposed OTA
3.1.2 Linearity Considerations
3.2 Design of the Fully Differential OTA
3.2.1 Basics of the Fully Differential OTA
3.2.2 Common-Mode Feedback Circuit
3.3 Design of the 1-MHz 7th-Order Butterworth Lowpass
Filter
3.3.1 Basic Filter Theorem
3.3.2 The Butterworth Lowpass Filter
3.3.3 Butterworth Lowpass Filter Using CMOS OTA
Chapter 4 Simulation Results and Discussions
4.1 The OTA Simulation Results
4.1.1 Characteristics of the OTA
4.1.2 Distortion of the OTA
4.2 The Fully Differential OTA Simulation Results
4.3 Simulation Results of the 1-MHz 7th-Order Butterworth
Lowpass Filter
4.3.1 Characteristics of the Filter
4.3.2 Distortion of the Filter
4.4 Simulation Result Discussions

Chapter 5 Experimental Results and Discussions
5.1 Measured Results of the OTA
5.2 Measured Results of the 1-MHz 7th-Order Butterworth
Lowpass Filter
5.3 Experimental Result Discussions

Conclusions

Reference

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