1.Print board layer selection rules, that is, the clock frequency is 5MHZ or pulse rise time is less than 5ns, the PCB board should to be made multilayer, if using double board, one side of the PCB should be used as a complete ground plane.
2.Multilayer board is a better board-level EMC protection design measure, it is recommended preferred.
3.The separated ground wire of signal circuit and the power circuit should be finally grounded in a public ground; the two should not have a common ground wire.be used as a complete ground plane
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