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取样示波器是自动脉冲测试系统中的一个主要组成单元。取样时基抖动噪声是影响时域波形采集精度的主要误差源之一,本文利用数字反卷积方法大大减小了这种噪声的影响。首先用统计方法确定出取样时间抖动分布的概率密度函数,然后将此函数作为卷积核,与实测波形的若干次平均结果实行反卷积,其结果便是抖动影响已被大大减小的测试波形,从而使系统的测试精确度得到提高。文中给出一些计算机模拟结果,它们都令人满意地证明了本文所述方法的成功。
Sampling oscilloscope is an important component of automatic pulse test system. Sampling time-base jitter noise is one of the main error sources that affect the accuracy of waveform acquisition in time domain. In this paper, the effect of this kind of noise is greatly reduced by digital deconvolution method. Firstly, the probability density function of jitter distribution in sampling time is first determined by statistical method. Then, this function is used as convolution kernel to deconvolute several times the averaged result of the measured waveform. As a result, the jitter effect has been greatly reduced Waveform, so that the system test accuracy is improved. Some computer simulations are presented in this paper, and they all satisfactorily demonstrate the success of the method described here.