| 基于提高有载Q的120 MHz低相噪晶体振荡器设计 |
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| 引用本文： | 黄显核,王艳,严刚峰.基于提高有载Q的120 MHz低相噪晶体振荡器设计[J].电子科技大学学报(社会科学版),2009(5). |
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| 作者姓名： | 黄显核 王艳 严刚峰 |
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| 作者单位： | 电子科技大学空天科学技术研究院; |
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| 基金项目： | 2007年度四川省学术和技术带头人培养基金 |
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| 摘 要： | 从反馈振荡器的Leeson模型相位噪声表达式出发,分析了有载Q的重要性,针对基本皮尔斯振荡电路推导出有载Q的表达式,得到C1越大,有载Q越高的结论。在此基础上设计了一个120MHz AT切低相噪晶体振荡器样机,经实际测试,该振荡器在偏离载频100Hz、220Hz、1kHz和底部相位噪声分别达到了-130dBc/Hz、-142dBc/Hz、-155dBc/Hz和小于-175dBc/Hz。结果表明,从提高有载Q出发对低相噪晶体振荡器进行设计是可行的。
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| 关 键 词： | 晶体振荡器 相位噪声 Leeson模型 有载Q 皮尔斯振荡电路 |
Design of 120 MHz Low Phase Noise Crystal Oscillator Based on Improving the Loaded Q |
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| HUANG Xian-he,WANG Yan, YAN Gang-feng.Design of 120 MHz Low Phase Noise Crystal Oscillator Based on Improving the Loaded Q[J].Journal of University of Electronic Science and Technology of China(Social Sciences Edition),2009(5). |
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| Authors: | HUANG Xian-he WANG Yan YAN Gang-feng |
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| Institution: | HUANG Xian-he,WANG Yan,, YAN Gang-feng(Institute of Astronautics & Aeronautics,University of Electronic Science & Technology of China Chengdu 610054) |
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| Abstract: | The importance of the loaded Q are analyzed on the basis of phase noise equation of Leeson model in feedback oscillator,the formula of loaded Q is derived by the analysis of Pierce oscillator circuit,and we can draw a conclusion that the larger C1 is,the higher loaded Q becomes.Based on this conclusion,a design of the prototype 120 MHz AT-cut crystal oscillator is presented and the experiments are carried out.The measurement results of phase noise are -130 dBc/Hz@100 Hz,-142 dBc/Hz@220 Hz,-155 dBc/Hz@1 kHz ... |
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| Keywords: | crystal oscillators phase noise Leeson model loaded Q Pierce oscillator circuit |
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