调查供应电压波动对石英晶体振荡器相位噪声的影响
Lin Xu1, Peng Ye1, Shuang Liao2
1School of Automation Engineering, University of Electronic Science and Technology of China (UESTC), No. 2006, Xiyuan Ave., West Hi-Tech Zone, 611731 Chengdu, Sichuan, China.
The Review of scientific instruments
|August 16, 2024
概括
这项研究引入了一个新的模型,以了解电压变化如何影响石英晶体振荡器相位噪声. 该模型准确地预测相位噪声,揭示了影响电压波动下性能的关键因素.
科学领域:
- 电气工程 电气工程
- 物理 物理学 物理
- 信号处理 信号处理
背景情况:
- 电源电压波动是石英晶体振荡器 (XO) 中已知的但不太了解的相位噪声来源.
- 现有的模型缺乏对这种特定影响的全面分析,在不同的电压条件下了解XO性能存在差距.
研究的目的:
- 开发一种新型模型,即相噪驱动灵敏度 (PNDS) 模型,以阐明电源电压波动影响XO相噪的机制.
- 为PNDS提供清晰的频域表示,并确定其带宽 (fS).
主要方法:
- 开发一个包含五种噪声调制过程的PNDS模型.
- 在频域中分析PNDS分布.
- 在各种供应电压噪声条件下使用PNDS模型预测10MHzXO的相位噪声.
- 对模型预测的实验验证.
主要成果:
- PNDS模型清楚地表明了频率域中的灵敏度分布.
- 确定了一个PNDS带宽 (fS),类似于利森模型的噪声带宽,它限制了供应电压波动的影响.
- 该模型在不同的电压噪声场景下成功预测了10 MHz振荡器的相位噪声.
- 实验结果证实PNDS底部是由维持放大器的相调节决定的.
结论:
- 新的PNDS模型有效地解释和预测电源电压波动对XO相噪声的影响.
- PNDS带宽 (fS) 是理解电压诱导的相位噪声限制的一个关键参数.
- 该研究强调了维持放大器相调节,共振器振幅频率效应和二极管调在确定整体相位噪声特征中的不同作用.
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