A time interval measurement method and device based on orthogonal sampling interpolation

Abstract

This application relates to a time interval measurement method and device based on quadrature sampling interpolation. The method uses two dual-channel ADCs to sample the reference clock signal and its phase-shifted quadrature signal respectively. The triggering of the two ADCs The acquisition signals are the rising edges of the start signal and the end signal in the signal to be tested respectively. The two channels of the dual-channel ADC require data acquisition at the same time, and the phase information is calculated by using the data collected by the dual channels, thus realizing the time interval measurement. The precise measurement of the interpolation method in the middle of the technology, the index can reach the level of picoseconds.

Description

technical field [0001] The present application relates to the technical field of time interval measurement, and in particular, to a time interval measurement method and device based on orthogonal sampling interpolation. Background technique [0002] Time interval measurement technology is of great significance to the national economy and national defense construction. Accurate time interval measurement techniques, especially picoseconds (1ps=10 -12 The measurement technology of s) magnitude is more important, and the time interval measurement in the modern sense began in the era of vacuum tubes. For decades, its measurement methods have been continuously improved and developed. From the earliest time interval expansion method to the current interpolation method and delay line method, it can be said that there are many kinds. According to the implementation technology, the time interval measurement methods can be roughly divided into two categories: analog and digital; acco...

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Problems solved by technology

from figure 2 It can be seen that the key is to measure the accurate phase value of the start (start) signal and stop (stop) signal. The general method is to use a direct ADC to collect the voltage value of the clock at this point. Some documents also use this method. However, this method has an obvious problem, that is, continuous high-speed sampling, and combining the data before and after (including a whole cycle) to analyze the initial phase. This method is complex and difficult to implement, and it is difficult to guarantee real-time performance.

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