PCB Tech - Sharing a copper plating is a PCB design function

Copper coating is an important part of PCB design. Whether it is domestic PCB design software, some foreign Protel, PowerPCB provide intelligent copper coating function, then how to apply copper, I will share some of my thoughts with you, Hope to bring benefits to colleagues.

The so-called copper pour is to use the unused space on the PCB as a reference surface and then fill it with solid copper. These copper areas are also called copper filling. The significance of copper coating is to reduce the impedance of the ground wire and improve the anti-interference ability; reduce the voltage drop and improve the efficiency of the power supply; connecting with the ground wire can also reduce the loop area. Also for the purpose of making the PCB as undistorted as possible when soldering, most PCB manufacturers will also require PCB designers to fill the open area of the PCB with copper or grid-like ground wires. If the copper is not handled properly, it will Whether the gains or losses are rewarded or lost, is the copper coating "the advantages outweigh the disadvantages" or "the disadvantages outweigh the advantages"?

Everyone knows that under high frequency, the distributed capacitance of the wiring on the printed circuit board will play a role. When the length is greater than 1/20 of the corresponding wavelength of the noise frequency, an antenna effect will occur, and the noise will be emitted through the wiring. If there is a poorly grounded copper coating in the PCB, the copper coating becomes a tool for spreading noise. Therefore, in a high-frequency circuit, do not think that the ground wire is connected to the ground. This is the "ground "Line", must be less than λ/20, punch through holes in the wiring, and "good ground" with the ground plane of the multilayer board. If the copper coating is handled properly, the copper coating not only increases the current, but also plays a dual role of shielding interference.

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