What is 3W rule 20h rule 55 rules

What is 3W rule 20h rule 55 rules 3W rules: In order to reduce the line crosstalk, it should be ensured that the line spacing is large, and when the center spacing is not less than 3 times, it can maintain 70% of the electric field does not interfere with each other, called 3W rules. To reach a 98% electric field does not interfere with each other, 10W spacing can be used. 19) 20h rules: Since the electric field between the power layer and the formation is changed, electromagnetic interference is radiated outward on the edge of the plate. Side edge effect. The solution is to remove the power layer so that the electric field is only conducted within the range of the ground layer. In one h (the thickness between the power and the ground), 70% of the electric field can be limited to the side edge of the ground layer; the contraced 100h can be limited to 98% of the electric field. 20) Five - Five Rules: The number of printed boards is selected, that is, the clock frequency to 5MHz or pulse rise time is less than 5ns, and the PCB board must use multi-layered board, which is a general rule, sometimes for the cost In this case, in this case, it is best to use a double-laminate structure. Technology area PROTEL Design PCB Usage Distribution of VIA and PAD PCB engineer must see: 105 Basic Guidelines for design! Analysis of AWR RF, Microwave Design Software and Its Applications Integrated wiring system structure diagram decomposition PCB engineer makes Layout's design points

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