基于并行结构的随机等效时间采样技术研究与实现

Research and implementation of a random equivalent time sampling based on parallel structure

传统的随机等效采样方法随着水平扫描速度增加,在时间观察窗口变窄的情况下,充分重构波形需要花费很长时间。在随机等效采样的理论基础上,分析了决定等效采样率的2个关键环节——ADC实时采样率和内插倍数,提出了一种基于并行采样结构的等效采样方法,给出了实现方法,并对关键的时间间隔测量电路和高速触发通道进行了说明。实验数据表明,并行结构的随机等效采样方法不仅获取波形的效率更高,而且为进一步提高等效采样率提供了基础。

As the sweep speed increased, it takes longer and longer time for the traditional random equivalent sampling method to reconstruct waveform. Based on the theory of random equivalent sampling, the two key parts determining the equivalent sampling rate -ADC real-time sampling ratio and interpolation, are analyzed, and an equivalent sampling based on parallel sampling structure is proposed. The implementation method is given, and the time interval measurement circuit and high speed triggering channel are described. The experiment data show that, the random equivalent sampling method based on parallel structure not only improves the waveform reconstruction efficiency, but also provides the basis for further improving the equivalent sample rate.