A new phase difference detection circuit and method

Abstract

The invention relates to a phase difference detection circuit and a method thereof in the signal detection field, and especially relates to a phase difference detection circuit which detects phase difference of two signals and an ahead or lagged relation of phases and a method thereof. A purpose of the present invention is to solve a problem that in the prior art detection of phase difference andan ahead or lagged relation of phases are too complex. The novel phase difference detection circuit and the method thereof are provided to accurately detect the phase difference of two signals and the ahead or lagged relation. The detection circuit is simple and reliable. A technical scheme of the invention is as follows: the detection circuit comprises a phase detection module 1, a phase detection module 2, an A / D analog to digital conversion circuit 1, an A / D analog to digital conversion circuit 2 and an FPGA processor. The invention mainly is applied to detection of phase difference of twosine waves or square wave signals and an ahead or lagged relation.

Description

technical field [0001] The invention relates to a phase difference detection circuit and method in the field of signal detection, in particular to a phase difference detection circuit and method for detecting the magnitude of the phase difference and the leading or lagging relationship between two signals. Background technique [0002] In the field of signal detection, it is often necessary to detect the phase difference between two signals, and the phase difference includes the magnitude of the phase difference and the leading or lagging relationship of the phase. A general phase detection chip (such as AD8302, etc.) can measure the phase difference of two signals, and its range is 0°~180°, but it cannot measure whether the phase difference of two signals is between 0°~+180° or 0°. °~-180° range, so it is impossible to judge the leading or lagging relationship of the phases of the two signals. [0003] "China Test" published an article entitled "Dual Longitudinal Mode Dual...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the method of detecting the phase difference and the phase lead or lag relationship in the prior art is too complicated, and provide a new phase difference detection circuit and method to accurately detect the phase difference and the lead lag relationship of two input signals , the detection circuit is simple and reliable

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