Analysis and Design of Gap-Filler of DAB System 林彥呈、林漢年
E-mail: [email protected]
ABSTRACT
ABSTRACT This research is aimed at designing a signal repeater, that is so-called gap filler, to solve the problem of the dead zone of DAB broadcasting signal due to building blockage. Beside providing the function of solving the dead zone problem, this repeater can also relay and improve the signal quality which are blocked by the buildings. The work mentioned in this study is to design a first stage low noise amplifier with frequency range between 170MHz and 240MHz for digital radio, and to investigate the appropriate transmit power and antenna to match the amplifier. The active device used in this low noise amplifier design is BFG25W by Philips Company. For designing the amplifier, I first used the design software Microwave Office 2000 to simulate the circuit and then implemented the impedance matching according to the theory of RF circuit. To obtain the best performance, I used a great deal of surface mounted devices in achieving the impedance matching for this specified frequency range. The low noise amplifier is made on the printed circuit board and its S parameter measured by the Agilent network analyzer.
Keywords : DAB ; Digital Audio Broadcasting ; Gap Filler ; LNA ; Low Noise Amplifier ; RF Circuit ; Radio Frequency Circuit ; SMD ; Surface Mounted Device ; Lump Element ; NA ; Network Analyzer
Table of Contents
目錄 封面內頁 簽名頁 授權書………iii 中文摘要………
………iv 英文摘要………v 誌謝………
………vi 目錄………vii 圖目錄………
………ix 表目錄………xiii 第一章 緒 論 1.1 前言………1 1.2 研究動機及方法………2 1.3 論文 架構………3 第二章 基本理論 2.1微帶線(Microstrip Line)………5 2.2阻抗匹配（Impedance match）………6 2.2.1 集總元件阻抗匹配電路………9 2.2.2 微帶線 阻抗匹配………11 2.3散射參數（Scattering Parameters）………13 2.4 反射係數與增益方程 式………16 2.4.1反射係數………16 2.4.2增益方程式………
………18 2.5 穩定性………25 2.6微波電路雜訊………
…30 第三章 一級低雜訊放大器製作 3.1設計考量與步驟………34 3.2一級低雜訊放大器(1’st Low Noise Amplifier)………35 3.3 BandⅢ一級低雜訊放大器匹配電路設計流程………38 3.4 L-Band一級低雜訊放大器……
………45 第四章 二級低雜訊放大器製作 4.1 BandⅢ第二級低雜訊放大器………54 4.2 BandⅢ二 級低雜訊放大器………61 4.3BandⅢ改善二級低雜訊放大器………66 第五章 結論………
………75 參考文獻………77 附錄A………
………79 REFERENCES
參考文獻 [1] 2001年國際數位廣播研討會手冊 [2] Microwave office 2000 user’s guide [3] David M. Pozar, “Microwave Engineering”, Second Edition, Chapter 2, Chapter 5, Wiley, 1998.
[4] Silvester, P., and Benedek, P., “Microstrip discontinuity capacitances for right angle bands, T-junction and crossings”, IEEE Trans., MTT-21, No. 5, May 1973, 341-346.
[5] Bahl, I. J., and Garg, Ramesh, “ Simple and accurate formulas for microstrip with finite strip thickness”, Proc. IEEE, 65, pp. 1611-1612, 1977.
[6] Fouad, H.; Sharaf, K.; El-Diwany, E.; El-Hennawy, H.; “AN RF CMOS CASCODE LNA WITH CURRENT REUSE AND INDUCTIVE SOURCE DEGENERATION”, Circuits and Systems, 2001. MWSCAS 2001. Proceedings of the 44th IEEE 2001 Midwest Symposium on , Volume: 2 , 2001 [7] Reinhold Ludwig, and Pavel Bretchko, “RF Circuit Design Theory and Applications”, Chapter 4, Prentice Hall, 2000 . [8] Guillermo Gonzalez, “Microwave Transistor Amplifiers Analysis and Design”, Second Edition, Chapter 3, Chapter 4, Prentice Hall,1997.
[9] M. L. Edwards and J. H. Sinksy, “A New Criteria for Linear 2-Port Stability Using a single Geometrically Derived Parameter”, IEEE Trans.
Microwave Theory and Techniques, vol. MTT-40, pp. 2803-2811, December 1992.
[10] Behzad Razavi, ”RF Microelectronics” Section 2.3, Prentice Hall, 1998.
[11] Wei Guo; Daquan Huang; ASIC, 2002. “The Noise and Linearity Optimization for A 1.9-GHz CMOS Low Noise Amplifier”Proceedings.
2002 IEEE Asia-Pacific Conference on , 2002 Page(s): 253 -257 [12] Luca Daniel and Manolis Terrovitis, “A Broadband Low-Noise Amplifier”, EECS217 “Microwave Circuit Design” [13] 柯承志, “寬頻主動型天線設計與分析”, 大葉大學 [14] 經濟部工業局, “高頻電路設計”
[15] Philips Semiconductors, “BFG425W DATA SHEET”, PHILIPS 1998 Mar 11 [16] Philips Semiconductors, “1.5GHz LOW NOISE AMPLIFIER WITH THE BFG425W”, PHILIPS [17] 李春生, “平面式主動天線研究”, 大葉大學 [18] Terry Edwards, “Foundations for Microstrip Circuit Design”, Second Edition, Chapter 3, Chapter 4, Chapter 5, Wiley, 1991.
[19] Samuel Y. Liao, “Microwave Circuit Analysis and Amplifier Design”, Chapter 4, Chapter 7, Prentice Hall, 1987.
[20] George D. Vendelin and Anthony M. Pavio and Ulrich L. Rohde, “Microwave Circuit Design Using Linear and Nonlinear Techniques”, Chapter 4, Wiley, 1990.
