一种用于宽带取样示波器的幅值校准方法  

An Amplitude Calibration Method for Broadband Sampling Oscilloscopes

作　　者：银子燕 张敏娟[1,2] 冯心如 景宁[1,2] 胡媛媛 卫晨博 YIN Ziyan;ZHANG Minjuan;FENG Xinru;JING Ning;HU Yuanyuan;WEI Chenbo(School of Information and Communication Engineering,North University of China,Taiyuan 030051,China;Research Institute Frontier Interdisciplinary Sciences,North University of China,Taiyuan 030051,China)

机构地区：[1]中北大学信息与通信工程学院,山西太原030051 [2]中北大学前沿交叉科学研究院,山西太原030051

出　　处：《测试技术学报》2024年第2期203-209,共7页Journal of Test and Measurement Technology

基　　金：国家自然科学基金青年科学基金资助项目(61505180);山西省自然科学基金资助项目(201901D111163);山西省基础研究计划资助项目(202203021221114)。

摘　　要：取样示波器采用顺序等效采样原理,可以实现对高速稳定信号进行采样、波形恢复、信号质量分析等,在高速通信、信息对抗等领域有广泛应用。但作为取样示波器核心器件的取样器,采用双肖特基二极管对称结构,因器件、布局布线等非对称性,导致差分输出的两路信号存在偏差等,造成测量波形的不准确。为更加准确地重建被测信号的真实值,提出一种基于最小二乘法的二进制幅值校准方法。通过实验验证,此方法能够准确计算校准系数,实现对幅值的校准,相对误差在1%以内,并且在采样点数较少的情况下仍然适用。结果表明,此方法可以用于宽带取样示波器的幅值校准。Sampling oscilloscopes using the principle of sequential equivalent sampling can achieve highspeed stable signal sampling,waveform recovery,signal quality analysis,etc.,in high-speed communications,information countermeasures and other fields with a wide range of needs.However,the sampler as the core device of the sampling oscilloscope uses a dual Schottky diode symmetric structure,which leads to deviations in the two signals of the differential output due to the asymmetry of the device,layout wiring,etc.,and introduces inaccuracies in the measured waveform.In order to reconstruct the true value of the measured signal more accurately,this paper proposes a binary amplitude calibration method based on the least squares method.It is verified that this method can accurately calculate the calibration coefficients and achieve the calibration of the amplitude with a relative error within 1%,and it is still applicable in the case of small sampling points.The results show that this method can be used for amplitude calibration of broadband sampling oscilloscopes.

关 键 词：取样示波器 等效采样 双肖特基平衡取样器 最小二乘法 幅值校准 

分 类 号：TN98[电子电信—信息与通信工程]