PCB copper-platinum treatment

　　Because the current IC working clock (digital IC) is getting higher and higher, its signal for the width of the line put forward certain requirements, the line width (copper platinum) is good for low frequency strong current, but for high frequency signal and data line signal, it is not the case, the data signal is more synchronization, high frequency signal is affected by skin effect. Therefore, the high-frequency signal should be thin and not wide, and should be short and not long, which involves the layout problem (the coupling of signals between devices), which can reduce the induced electromagnetic interference.

　　The data signal, however, appears on the circuit in the form of pulse, and its higher harmonic content is the decisive factor to ensure the correctness of the signal. The same wide copper platinum will have a skin effect on high speed data signals (distributed capacitance/inductance increases), which will lead to signal deterioration, data identification is not correct, and the data bus channel if the line width is inconsistent will affect the data synchronization problem (resulting in inconsistent delay), in order to better control the synchronization of data signals. Therefore, the serpentine routing appears in the data bus routing, which is to make the signal in the data channel more consistent in delay.

　　The large area of copper-laying is for shielding interference and induction interference, and the double panel can be used as the copper-laying layer; The multi-layer board does not have the problem of copper, because the power layer is a good shield and isolation.