摘要
随着宽带通信技术的不断发展，对宽带压控振荡器的需求越来越大。以变容二极管作为调谐器件的表贴型宽带压控振荡器因其具有体积小、成本低、设计灵活等优点，在宽带压控振荡器中占有很大比例。
本文介绍了负阻振荡器的原理，分析了影响振荡器的相位噪声的因素，并讨论了噪声最佳化问题。根据降低相位噪声的原则，给出了宽带压控振荡器中晶体管和变容二极管的选择方法，并给出了一个带宽为3～4GHz的压控振荡器的设计实例。测试结果表明该压控振荡器较好地达到了设计指标。
With the development of broadband communication technology , the requirement for broadband Voltage Controlled Oscillators(VCO) is more and more. Because of small size, low cost and easy to design,the broadband VCOs based on transistors Occupy very large proportion.
This paper introduces the principle of the negative resistance oscillator,and analyses the factors of affected phase noise, and then .discusses the optimization of the phase noise.In order to reduce the phase noise,the ways of select transistors and varactors are given .A 3GHz to 4GHz broadband VCO and related design are presented. The measure results indicate that the VCO reach the ami of the design.
引文
[1] 顾其诤，项家桢，袁孝康微波集成电路设计人民邮电出版社 1978，第一版：448—533。
[2] 白居宪 低噪声频率合成 西安交通大学出版社 1995，第一版：11—15，19—20，28—36。
[3] Ulrich L. Rohde, David P. Newkirk RF/Microwave Circuit Design For Wireless Applications, JOHN WILEY & SONS, INC., 2000, 124-237, 716-848。
[4] 清华大学《微带电路》编写组 微带电路 人民邮电出版社 1976，第一版：367—405．
[5] 陈为怀 李玉梅 微波振荡源 人民邮电出版社 1984，第一版：11—101．
[6] 朱明 微波电路 国防科技大学出版社 1994，第一版：110—146．
[7] Koji Harada, An s-parameter transmission model approach to vco analysis, RF Design, March 1999, pp. 32-42.
[8] Anthony M. Pavio George D. Vendelin and Ulrich L. Rohde, Microwave CircuitDesign Using Linear and Nonlinear Techniques, JohnWiley & Sons, Inc., 1990, pp. 384-491.
[9] S. Alecho, Analysis method characterizes microwave oscillators, part 1, Microwaves& RF, September 1998, pp. 71-78.
[10] Frank Baberg, Low noise vcos: Key components for base stations, Microwaves& RF, June 2000, pp. 100-108.
[11] D. B. Leeson, A simple model of feedback oscillator noise spectrum, Proceedings Letters, February 1966, pp. 329-330.
[12] Randall W. Rhea, Oscillator Design and Computer Simulation, 1995, 2nd Ed., pp. 65-76.
[13] 吴万春 集成固体微波电路 国防工业出版社 1981，第一版：418—470。
[14] Ganesh R. Basawapatna, A unied approach to the design of wide-band microwavesolid-state oscillators, IEEE Trans. Microwave Theory Tech., May 1979, pp. 379-385.
[15] David M. Pozar, Microwave Engineering, Addison-Wesley Publishing Company, Inc., 1990, pp. 205-274, 330-336, 582-658.
[16] David A. Johns and Ken Martin, Analog Integrated Circuit Design, John Wiley & Sons, Inc., 1997, pp. 648-692
