Signal edge comparator

Abstract

The invention discloses a signal edge comparator, which comprises a pulse conversion circuit used for respectively converting rising edges or falling edges of two signals to be compared into corresponding pulse signals; and the signal comparison circuit is electrically connected with the pulse conversion circuit and is used for comparing the two pulse signals and outputting a comparison result. According to the invention, the edge change of a signal is converted into a pulse signal, the converted pulse signal is compared, an output result is locked, two paths of control signals are set at the same time, one path of control signals is set to be closely related to an input signal, a comparison window of a comparator is favorably set, and the other path of reset signal rst is randomly reset. According to the invention, the successive relationship of the edge change of two groups of signals with extremely close phases in the time domain can be quickly identified, and meanwhile, the comparison result can be output and latched, so that the acquisition of a digital circuit can be facilitated.

Description

technical field [0001] The present invention relates to the technical field of integrated circuits, in particular to a signal edge comparator. Background technique [0002] In digital circuits, it is usually necessary to determine the phase relationship of a group of signals when the same edge change occurs. At present, clock-driven flip-flops are often used to lock different signals, and according to the output of the flip-flop, it is judged that the same edge change occurs in the time domain. the sequence relationship. This technique is constrained by the frequency of the clock and the setup / hold time of the flip-flop, so when there is a group of signals with the same kind of edge changes very close, it will not be possible to discriminate using this method. SUMMARY OF THE INVENTION [0003] The embodiment of the present invention provides a signal edge comparator to solve the problem in the prior art that the phase relationship of a group of signals whose edges of the ...

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Problems solved by technology

[0003] An embodiment of the present invention provides a signal edge comparator, which is used to solve the problem in the prior art that it is impossible to distinguish the phase relationship of a group of signals whose edges of the same type are very close to each other

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