Return path via hole viewing method and system

Abstract

The application discloses a return path via hole viewing method and system. The method comprises the steps of: identifying all signal via holes and return path via holes in a target PCB; respectivelycalculating distances between each signal via hole and all the return path via holes to obtain corresponding N groups of distances, wherein the value of N is consistent with the number of the signal via holes in the target PCB; respectively determining out a corresponding distance with the minimum distance value from each group of distances so as to obtain corresponding N shortest distances; respectively determining whether each shortest distance is smaller than a preset distance threshold; if yes, determining that the return path via holes corresponding to the shortest distances accord with the layout standard; and if no, determining that the return path via holes corresponding to the shortest distances do not accord with the layout standard. According to the application, the shortest distances between the signal via holes and the return path via holes are calculated by utilizing common computational software of a computer so as to determine whether the return path via holes accord with the layout standard, thereby greatly shortening viewing time of the signal path via holes.

Description

technical field [0001] The invention relates to the field of circuits, in particular to a method and system for inspecting return path vias. Background technique [0002] A transmission line for a signal carries the signal from one end to the other. All transmission lines are composed of two paths, one of which is called the signal path, and the other is called the return path, such as figure 1 shown. In the four-layer circuit transmission line, such as figure 2 As shown, the first layer circuit and the fourth layer circuit are the signal layer, and the second layer circuit and the third layer circuit are the GND layer, that is, the reference plane. Such as figure 2 As shown in the transmission direction of the signal in , the signal path starts from the first layer circuit and connects to the fourth layer circuit through the signal via. The return current will switch from the third layer circuit back to the second layer circuit. At this time, the return path is disc...

AI Technical Summary

Problems solved by technology

However, any PCB board has many vias, so this method is very time-consuming

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