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PCB wiring tamper control

2022-04-09

PCB wiring tamper control

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1. Interpretation of 3W principle
The distance between lines maintains 3 times the line width. In order to reduce crosstalk between lines, ensure that the line spacing is large enough. If the line center distance is not less than 3 times the line width, 70% of the electric field between lines can be kept from interfering with each other, which is called 3W rule.
2. Tamper control
Crosstalk refers to the mutual interference caused by long parallel wiring between different networks on PCB, which is mainly due to the distributed capacitance and distributed inductance between parallel lines.
The main measures to overcome crosstalk are:
Increase the spacing of parallel wiring and follow the 3W rule.
Insert a grounded isolation line between parallel lines.
Reduce the distance between the wiring layer and the ground plane.