Abstract In this paper, a hybrid time-base (HTB) device for the coherent sampling oscilloscope is presented. The HTB device makes it possible to reduce the uncertainty of determining the time position of the sample in the horizontal channel of the sampling oscilloscope. For its functioning, the proposed HTB device requires that the system-under-test, in addition to the test signal, also has a synchronous reference clock – harmonic oscillation. It should be noted that both the test signal and the harmonic reference clock are sampled simultaneously. The harmonic reference clock is connected to one of the oscilloscope channels and a special algorithm processes the clock samples and adjusts the coherent sampling mode. Two techniques of determining the position of the sample on the time axis are combined in the HTB device – the “trigonometric”, when the position is calculated by the arccosine or arcsine formula of the reference clock sampling value, and the interpolation method, according to which the time position of the sample is found by averaging the positions of two adjacent samples, obtained using said “trigonometric” technique. Primary experimental studies have shown that using the HTB device can reduce jitter of the sampling oscilloscope by several times and the drift with constant time distortion components is practically absent in this device.

中文翻译：

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相干采样示波器的混合时基设备

摘要 本文提出了一种用于相干采样示波器的混合时基（HTB）设备。HTB装置可以降低确定采样示波器水平通道中样本时间位置的不确定性。对于其功能，建议的 HTB 设备要求被测系统除了测试信号外，还具有同步参考时钟 - 谐波振荡。需要注意的是，测试信号和谐波参考时钟都是同时采样的。谐波参考时钟连接到一个示波器通道，一种特殊的算法处理时钟样本并调整相干采样模式。在 HTB 设备中结合了两种确定样本在时间轴上的位置的技术——“三角函数”，当通过参考时钟采样值的反余弦或反正弦公式计算位置时，以及使用所述“三角”技术获得的通过平均两个相邻样本的位置来找到样本的时间位置的插值方法. 初步实验研究表明，使用HTB器件可以将采样示波器的抖动降低数倍，并且该器件几乎不存在具有恒定时间失真分量的漂移。