Device and method for detecting phase difference

Abstract

A phase difference detection method is used to detect the phase difference of a first signal and a second signal, and has virtually equal frequency. The method includes the following steps that: firstly, a detection signal is generated; secondly, according to the first signal and the second signal, sampling of the detection signal is respectively carried out to obtain a first sampling value and asecond sampling value; thirdly, whether the judgment condition that the first sampling value is equal to the previous first sampling value and the second sampling value is equal to the previous second sampling value exists is judged; when the judgment condition does not exist for the first time, the delay time of the detection signal at this moment is stored as a first time; when the judgment condition does not exist for the second time, the delay time of the detection signal at this moment is stored as a second time; finally, according to the first time and the second time, the phase difference of the first signal and the second signal can be obtained.

Description

technical field [0001] The present invention relates to a phase difference detection device, and in particular to a phase difference detection device which detects the phase difference between a plurality of target signals by delaying the phase of the detection signal. Background technique [0002] Please refer to Figure 1B Figure 1A and 1B , Figure 1A is a block diagram of a conventional phase difference detection device, Figure 1B Yes Figure 1A The relevant signal timing diagram of the phase difference detection device. When it is desired to know the phase difference between the timing signals CK1 and CK2 with the same frequency and different phases, input it to the exclusive OR (Exclusive OR, XOR) gate 110 to obtain the exclusive signal XS, and combine it with the signal generator 130 to generate The sampling signal SS is input to a flip-flop 120 to sample the mutual exclusion signal XS with the sampling signal SS to obtain a sampling result SO. Then calculate t...

AI Technical Summary

Problems solved by technology

In this way, in general implementation situations, the measurement is mostly performed only with the measurement signal SS whose frequency is slightly higher than that of the timing signal, so that the measurement result of the phase difference between the timing signals CK1 and CK2 is less accurate.

In addition, to generate the measurement signal SS with a frequency higher than that of the timing signals CK1 and CK2, an expensive serial number generator 130 must be used to generate it, so that the cost of the phase difference detection device is relatively high.

Images