3W principle [easy to understand]

Hello everyone , I meet you again , I'm your friend, Quan Jun .

Purpose ：

In order to reduce the electromagnetic crosstalk between wires .

Method ：

The distance between the centers of the two lines must be at least greater than 3 Times the line width . If the center distance of the line is not less than 3 Double the line width , Then keep 70% The electric fields between the wires are not interfering with each other , be called 3W principle . To achieve 98% The electric fields don't interfere with each other , You can use 10W principle . Generally, in the design process, due to the dense routing, all signal lines cannot meet 3W Words , We can only use sensitive signals 3W Handle , For example, clock wiring 、 Differential line 、 video 、 Audio , Reset line , And other key circuits of the system , When multiple high-speed signal lines run for a long distance , In order to reduce the crosstalk between lines , Must be mandatory 3W principle .

Constrain with rules , however The distance between two lines used in the rule is the edge distance . Therefore, the value set by the rule should be 10.8 . （ That is, twice the line width 10.8=5.4X2）

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