Copper in the PCB production process, has a very important position, sometimes the success or failure of copper, related to the quality of the entire board. The so-called copper, copper is filled into the solid substrate of the PCB free space.
Copper has a large area of copper and grid copper two ways, a large area of copper increased current and shielding, but if the wave soldering, the board may tilt, or even blistering. Grid copper can reduce the heating surface of copper, but also play a role of electromagnetic shielding. However, the grid is composed of traces. If the width of traces is not correct, interference signals will be generated.
Copper has many benefits for the PCB, such as improving the anti-noise ability, reduce the potential difference, reduce the ground impedance, improve anti-interference ability, reduce voltage drop, improve power efficiency, connected with the ground, reducing the loop area, cooling , Reduce the impedance. Since there are so many advantages of copper, in the operation, what should pay attention to it?
1, if the PCB to more, there are SGND, AGND, GND, it is necessary to the most important "ground" as a reference to independent copper.
2, the circuit in the crystal as a high-frequency source, near the copper, around the crystal, and then the crystal case separately ground.
3, do not appear sharp, that is, more than 180 ° angle, otherwise it will form a transmitting antenna.