Tips for Avoiding High Frequency Interference of PCB

Dated:2017-10-24      Popularity:1097


HDI PCB Board

In the PCB board design, with the rapid increase of frequency, printed circuit boards have a lot of interference problems. With PCB board frequency contradiction and miniaturization contradiction become more and more prominent, board interference are also more and more complicated. Now we have some effective solutions to some of the interference problems.

For example, there is often a problem of interference in the design of laminates, so how do we solve them?

A multilayer printed circuit board is constructed to suppress radio frequency interference (RFI) generated by high frequency clock and data signals therein. Suppression is achieved by positioning clock line carrying the clock signal on the first voltage reference layer close to the second voltage reference layer. The two layers shield the clock signal from the signal lines on other layers. By forming a bridge in a second reference voltage layer close to the clock line, the bridge across the clock line width can further reduce noise. The capacitor is also preferably used to further suppress radiated noise. The capacitor offers an AC coupling between the first and second voltage reference to provide a low impedance path for high frequency noise generated by the clock signal. Thus, the second voltage reference layer operates as an effective continuous shield between the bridges.


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