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本文简述用差频取样法显示高重复频率毫微秒脉冲的原理。分析计算、展宽系数、对取样脉冲与讯号频率稳定度的要求和对电源电压稳定度的要求。分析取样时频谱的变换,指出当取样脉冲重复频率f_o约等于讯号重复频率f_s的倍数时,取样后失掉讯号的某些谱线;并与f_o≌f_s时比较,得出取样后讯号宽度不变,周期变短,幅度变小的结论;计算了取样后波形失真度。对取样脉冲频率与讯号频率间存在不同关系时的取样情况进行了讨论并用实验结果证明。 文中描述了研制的一台高重复频率脉冲取样示波器。利用基波(?)加三次谐波,再多次削波微分来形成窄的取样脉冲。示波器能显示几兆赫到一百兆赫间任意重复频率的脉冲讯号,频宽为300兆赫。用它能观察小至10毫伏的讯号。
This article briefly describes the principle of using the difference frequency sampling method to display the high repetition rate nanosecond pulse. Analysis and calculation, broadening coefficient, the sampling pulse and signal frequency stability requirements and stability of the power supply voltage requirements. When the sampling pulse repetition frequency f_o is about equal to the multiple of the signal repetition frequency f_s, some lines of the signal are lost after sampling, and compared with f_o≌f_s, it is obtained that the signal width after sampling is unchanged , The period becomes shorter, the amplitude of the smaller conclusion; calculated waveform distortion after sampling. The sampling situation when there is a different relationship between sampling pulse frequency and signal frequency is discussed and verified by experimental results. This paper describes a developed high repetition rate pulse sampling oscilloscope. The use of fundamental (?) Plus third harmonic, and then cut the differential to form a narrow sampling pulse. Oscilloscopes can display pulsed signals of any repetition rate from a few megahertz to a hundred megahertz with a bandwidth of 300 MHz. Use it to observe signals as small as 10 millivolts.