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博碩士論文 etd-0719102-184531 詳細資訊
Title page for etd-0719102-184531
論文名稱
Title
新型低電壓低功率指數電路及可變增益放大器
Novel Low-Voltage Low-Power Exponential Circuits and Variable Gain Amplifiers (VGA)
系所名稱
Department
畢業學年期
Year, semester
語文別
Language
學位類別
Degree
頁數
Number of pages
48
研究生
Author
指導教授
Advisor
召集委員
Convenor
口試委員
Advisory Committee
口試日期
Date of Exam
2002-06-24
繳交日期
Date of Submission
2002-07-19
關鍵字
Keywords
指數、可變增益放大器、低電壓
exponential, VGA, low voltage
統計
Statistics
本論文已被瀏覽 5724 次,被下載 44
The thesis/dissertation has been browsed 5724 times, has been downloaded 44 times.
中文摘要
本論文提出了二個適用在自動增益控制迴路的新型電流模式低電壓低功率可變增益放大器之電路設計。可變增益放大器包括了指數函數電路以及電流乘法器,其中指數函數電路可分別由泰勒展開式或多項式的近似實現。整個電路均操作在次臨界區,而放大器的增益可由指數函數近似電路來控制。以0.25μm的CMOS製程技術,經由HSIPCE模擬,驗證了電路理論的可行性。



Abstract
Two novel ultra-low-voltage (ULV) low-power (LP) variable gain amplifiers (VGA) are presented in this paper. These amplifiers based on complementary MOS transistors operating in weak inversion region are composed of pseudo-exponential current-to-current converters and analog multipliers. The gain of the amplifiers can be controlled by an exponential function circuit. The proposed circuits have been verified with the 0.25μm CMOS technology by HSPICE simulations. The simulation results confirm the feasibility of the proposed VGAs.
目次 Table of Contents
Contents

1. Introduction 1
2. Principle of Exponential Circuit Relating to VGA and AGC 2
2.1. Basic Principle of Operation 2
2.2. Design Principle of Pseudo-Exponential Function 2
3. Traditional Exponential Circuits in the Saturation Region 5
3.1 Pseudo-Exponential Function for MOSFETs 5
3.2 The Exponential Function Circuit Using A V-I Converter
and A Squarer Circuit 8
3.3 Exponential V-I Converter Using Composite NMOS 15
4. The VGAs Include Exponential Converters in the Subthreshold
Region 17
4.1. The First VGA 17
4.1.1 The Circuit Topology of Multiplier 17
4.1.2 The Exponential Current-to-Current Converter Based on
Taylor’s Series 18
4.1.3 Simulation Results 20
4.1.4 The VGA 22
4.1.5 Simulation and Results 24
4.2. The Second VGA 27
4.2.1 The Exponential Current-to-Current Converter Based on
Pseudo-Exponential Function Polynomial 27
4.2.2 Simulation Results 28
4.2.3 The VGA 31
4.2.4 Simulation and Results 33
5. Conclusion 38
References 39
參考文獻 References
References

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[6] Chunlei Shi, Yue Wu and M. Ismail, “Design of a low-power CMOS baseband circuit for wideband CDMA testbed”, Proceedings of the 2000 International Symposium, Low Power Electronics and Design, pp.222-224, 2000.
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[8] P. J. G. van Lieshout and R. J. van de Plassche, “A power-efficient, low-distortion variable gain amplifier consisting of coupled differential pairs”, IEEE J. Solid-State Circuits, vol. 32 no. 12 pp. 2105-2110, Dec. 1997.
[9] C. C. Chang and S. I. Liu, “Pseudo-Exponential Function for MOSFETs in Saturation” IEEE Trans. Circuits Syst. Ⅱ, vol. 47, no. 11, pp. 1318-1321, Nov. 2000.
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[11] W. Liu, C. C. Chang and S. I. Liu, “Realisation of Exponential V-I Converter Using Composite NMOS Transistors”, Electronics Letters, vol. 36, no. 1, pp. 8-10, Jan. 2000.
[12] A. Pesavento and C. Koch, “A wide linear range four quadrant multiplier in subthreshold CMOS”, IEEE International Symposium, Circuits and Syst. Vol. 2, pp. 240-243, 1999.
[13] C. C. Chang and S. I. Liu, “Weak inversion four-quadrant multiplier and two-quadrant divider”, Electronics Letters, vol. 34, no. 22, pp. 2079-2080, Oct. 1998.
[14] R. Fried and C. C. Enz, “CMOS parametric current amplifier”, Electronics Letters, vol. 32, iss. 14, pp. 1249-1250, July, 1996.
[15] C. C. Chang and S. I. Liu, “Current-Mode Pseudo-Exponential Circuit with Tunable Input Range”, Electronics Letters, vol. 36, no. 16, pp. 1335-1336, Aug. 2000.
[16] J. J. F. Rijns, “CMOS Low-Distortion High-Frequency Variable-Gain Amplifier”, IEEE J. Solid-State Circuits, vol. 31, no. 7, July, 1996.
[17] A. Motamed, C. Hwang and M. Ismail, “A Low-Voltage Low-Power Wide-Range CMOS Variable Gain Amplifier” IEEE Trans. Circuits Syst. Ⅱ,vol. 45, no. 7, pp. 800-811, July 1998.
[18] Hassan O. Elwan and Mohammed Ismail, “Digitally Programmable Decibel-Linear CMOS VGA for Low-Power Mixed-Signal Applications”, IEEE Trans. Circuits and Syst. Ⅱ,Analog and Digital Signal Processing, vol. 47, no. 5, May., 2000.
[19] K. Chung, G. Han and S. Kang, “A 0.35-μm CMOS Low Noise VGA”, Proceedings of the Second IEEE Asia Pacific Conference, pp. 5-8, 2000.
[20] C. C. Chang, M. L. Lin and S. I. Liu, “CMOS Current-Mode Exponential-Control Variable-Gain Amplifier”, Electronics Letters, vol. 37, no. 14, pp. 868-869, July, 2001.
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