Impedance line width searching method

Abstract

The invention provides an impedance line width searching method, and relates to the technical field of board card wiring. By utilizing a CAM (computer aided manufacturing) mode, various line widths of different spaces of the same line width requirement are formed by a genesis 2000 analysis function according to to-be-controlled impedance line width of each layer of a board card wiring part, and then needed data is obtained according to a line width and reality comparison result. By utilizing the method, a line width pole can be searched fast and effectively when the board card wiring is checked, and therefore the current carrying capability of a PCB (printed circuit board) is improved.

Description

technical field [0001] The invention relates to the technical field of board wiring, in particular to a method for finding impedance line widths. Background technique [0002] For the transmission of electronic signals in conductors, the ratio of voltage to current is called impedance. The reason for impedance control is impedance matching, that is, the impedance on the transmission line matches the impedance of the terminal components, and the transmission signal can be completely transmitted without loss. On the contrary, if If the impedance varies greatly, it will cause the reflection and attenuation of signal energy and the delay of signal arrival time. Therefore, the two important factors affecting impedance when wiring boards are line width and line spacing. The larger the line width, the lower the impedance. The line spacing mainly refers to the differential impedance part. The differential signal wiring needs a fixed spacing to have a stable impedance. Otherwise, th...

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Problems solved by technology

[0004] 1. The line width marked in the picture is not clear and easy to miss;

[0005] 2. For the line marked in the picture, the corresponding position line width cannot be found in the board card gerber;

[0007] 4. Specify the impedance line that needs to be controlled, and the corresponding line width cannot be found in the board gerber

[0022] Remarks: 1. From the above impedance production requirements, it can be seen that there is a phenomenon that the same line width controls different impedance values;

[0023] 2. In such cases, the above can only be distinguished by means of diagrams (where is the line of the same type of line width to control what type of impedance value)

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