The so-called copper coating is to use the idle space on the PCB as the base level, and then fill with solid copper, these copper areas are also known as copper filling. The significance of copper coating is to reduce the ground impedance and improve the anti-interference ability. Reduce voltage drop, improve power efficiency; Connected with the ground wire, the loop area can also be reduced. Key words:

　　Copper coating as an important part of PCB design, whether it is domestic Qingyufeng PCB design software, but also some foreign Protel, PowerPCB provides intelligent copper coating function, then how to apply copper, I will share some of my ideas with you, hope to bring benefits to peers.

　　The so-called copper coating is to use the idle space on the PCB as the base level, and then fill with solid copper, these copper areas are also known as copper filling. The significance of copper coating is to reduce the ground impedance and improve the anti-interference ability. Reduce voltage drop, improve power efficiency; Connected with the ground wire, the loop area can also be reduced. Also for the purpose of making PCB welding as much as possible without deformation, most PCB manufacturers will also require PCB designers to fill the open area of the PCB with copper or grid-like ground wire, if the copper is improperly treated, it will not reward the loss, whether the copper is "more good than bad" or "more bad than good"?

　　We all know that in the case of high frequency, the distributed capacitance of the wiring on the printed circuit board will work, when the length is greater than 1/20 of the corresponding wavelength of the noise frequency, there will be an antenna effect, and the noise will be emitted outward through the wiring, if there is a bad grounded copper coating in the PCB, the copper coating has become a tool to spread noise, therefore, in the high frequency circuit, Do not think that a certain place of the ground wire is connected to the ground, which is the "ground wire", and must be less than λ/20 spacing, punching holes in the wiring, and the ground plane of the multilayer board is "well grounded". If the copper coating is properly treated, the copper coating not only increases the current, but also plays the dual role of shielding interference.

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