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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Predicting phase noise in crystal oscillators
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Predicting phase noise in crystal oscillators

机译：预测晶体振荡器中的相位噪声

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摘要

In order to predict the phase noise in crystal oscillators an enhanced phase-noise model has been built. With this model, the power spectral densities of phase fluctuations can be computed in different points of the oscillator loop. They are calculated from their correlation functions. The resonator-caused noise as well as the amplifier-caused noise are taken into account and distinguished. To validate this enhanced model, the behavior of a batch of 10 MHz quartz crystal oscillators is observed and analyzed. The tested batch has been chosen in a facility production. Their associated resonators have been selected according to the value of their resonant frequency and their motional resistance. Open-loop and closed-loop measurements are given. The phase noise of the overall oscillator working in closed loop is provided by the usual active method. Theoretical and experimental results are compared and discussed.
机译：为了预测晶体振荡器中的相位噪声，建立了增强的相位噪声模型。使用该模型，可以在振荡器环路的不同点计算相位波动的功率谱密度。它们是根据它们的相关函数计算的。考虑并区分了由谐振器引起的噪声以及由放大器引起的噪声。为了验证这个增强的模型，观察并分析了一批10 MHz石英晶体振荡器的行为。经过测试的批次已在工厂生产中选择。已根据其共振频率和运动阻力选择了与其相关的共振器。给出了开环和闭环测量。闭环工作的整个振荡器的相位噪声由通常的有源方法提供。对理论和实验结果进行了比较和讨论。

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