論述了“100 MHz高速數(shù)字存儲示波器”的關(guān)鍵技術(shù)，著重闡述了系統(tǒng)設(shè)計(jì)的概念和原理、基于低速器件的高速數(shù)據(jù)采集技術(shù)、基于隨機(jī)取樣技術(shù)的等效采樣技術(shù)的實(shí)現(xiàn)。其中，隨機(jī)等效采樣的實(shí)現(xiàn)采用高分辨力測時擴(kuò)展器，使等效采樣率達(dá)到5 GSPS，時間測量分辨率達(dá)到200 ps，實(shí)現(xiàn)100 MHz(?3 dB)可重復(fù)信號的波形重現(xiàn)，并給出了實(shí)際應(yīng)用中重建的波形圖。The key techniques in the development of digital storage oscilloscope (DSO), a product type project taken by the authors, are discussed, of which the concept and the theory of the system design, the high-speed data acquisition technique based on the devices with lower operation speed, the equivalent sampling technique based on Random sampling are expatiated. The 200 ps time resolution and 5 GSPS equivalent sampling rate are gotten by using large-scale time expander, so the DSO can observe 100 MHz (?3 dB) seasonal signal. The results of experiment and application are presented in the end.