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首页> 外文期刊>Review of Scientific Instruments >Note: Precise phase and frequency comparator based on direct phase-time measurements
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Note: Precise phase and frequency comparator based on direct phase-time measurements

机译：注意：基于直接相位时间测量的精确相位和频率比较器

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摘要

We are reporting on the design, performance, and application results of a phase and frequency comparator based on the direct phase-time measurement using a high performance event timer. The advantages of this approach are the simple implementation, a broad frequency range, and the clear interpretation of the measured results. Primarily we analyzed the background instability of the instrument in a common-clock test when a 200 MHz clock signal was connected to both inputs and the noise bandwidth was kept at 5 Hz by a preprocessing of the measured data. The results show that the Allan deviation of the background instability follows 4 × 10/τ for a wide range of averaging intervals from 0.1 s up to 10 s. These results are better than background instability of commercially available state-of-the-art instruments based on the phase difference multiplication. Finally the instrument was used for comparison of two H-masers. This experiment proofed that one of possible applications is a comparison of low-noise highly stable frequency sources and measurement of their frequency stability in the time-domain. The noise background of the instrument was negligible for averaging intervals longer than 100 ms.
机译：我们正在报告基于相位和频率比较器的设计，性能以及应用结果，这些结果基于使用高性能事件计时器进行的直接相位时间测量。这种方法的优点是实施简单，频率范围宽以及对测量结果的清晰解释。首先，我们在一个公共时钟测试中分析了仪器的背景不稳定性，该测试是将200 MHz时钟信号连接到两个输入，并且通过对测量数据进行预处理将噪声带宽保持在5 Hz。结果表明，在0.1 s到10 s的平均间隔范围内，背景不稳定性的Allan偏差遵循4×10 /τ。这些结果优于基于相差乘法的市售最先进仪器的背景不稳定性。最后，该仪器用于比较两个H-masers。该实验证明，可能的应用之一是比较低噪声的高稳定频率源，并测量其在时域内的频率稳定性。仪器的噪声背景对于超过100 ms的平均间隔可以忽略不计。

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