PCB Fabrication

PCB copper

by:A-TECH      2021-04-05
PCB copper coating 2020-06-09 16:24:00 I believe that everyone has mastered a lot of knowledge about PCB, then do you know about PCB copper coating? Next, let us take a closer look together. Copper-clad has a very important position in the PCB production process. Sometimes the success or failure of copper-clad is related to the quality of the entire board. 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; in addition, it is connected to the ground wire to reduce the loop area. There are several problems that need to be dealt with in copper coating: one is the single-point connection of different grounds, which is connected through 0 ohm resistors or magnetic beads or inductance; the other is copper coating near the crystal oscillator, and the crystal oscillator in the circuit is a high-frequency emission source. It is to coat copper around the crystal oscillator, and then ground the shell of the crystal oscillator separately. The third is the problem of isolated islands (dead zones). If you think it is too big, it will not cost much to define a ground via and add it. Copper coating has many benefits to PCB, such as improving noise immunity, reducing potential difference, reducing ground wire impedance, improving anti-interference ability, reducing voltage drop, improving power efficiency, connecting to ground wire, reducing loop area, and heat dissipation , Reduce impedance. Since there are so many benefits of copper coating, what should be paid attention to during operation? 1. If the PCB has many grounds, such as SGND, AGND, GND, etc., the most important 'ground' should be used as a reference for independent copper pour. 2. The crystal oscillator in the circuit is a high-frequency emission source, and the copper around it surrounds the crystal oscillator, and then the shell of the crystal oscillator is grounded separately. 3. Do not have sharp corners, that is, an angle greater than 180°, otherwise it will form a transmitting antenna.
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