一种基于频差法的顺序等效采样方法及其实现

Research and Implementation of a Sequential Equivalent Sampling Method Based on Frequency Difference Method

基于频差法原理实现顺序等效采样方法,将时域问题转化到频域进行处理,理论上分析其可行性,给出频率差值的计算方法,可以通过频差设计任意等效采样频率.经过电路板实验验证,该方法简化了步进延时系统的复杂度,降低延时路径上的引入的干扰,目前实现的最小步进延时为1.71ps,最高顺序等效采样率约为585GS/s.为了缩短基于频差法的顺序等效采样所需的总时间,提出了倍频采样时钟的技术.该方法可以扩展应用到许多等效采样的领域中.

A new sequential equivalent sampling method is proposed based on the principle of frequency difference method,which transforms the sampling problem from time domain to frequency domain.The feasibility of the proposed method is theoretically analyzed and also verified by an experimental circuit board,where the equivalent sampling frequecy can be set arbitrarily by changing the frequency difference.This method simplifies the design of step delay system and reduces the interference introduced in time delay path,making out the minimum step delay is 1.71ps and the maximum sequential equivalent sampling rate is about 585GS/s.In order to shorten the total time required for sequential equivalent sampling,a technique of frequency doubling sampling clock is proposed.The proposed sampling method can be widely used in other equivalent sampling systems.