source:Industry News release time:2023-06-19 Article author:yu Popular:pcb
1. PCB (bottom of the circuit board) should consider inserting and installing electronic components. After blocking, the conductivity and signal transmission performance should be considered. Therefore, the lower the impedance, the better. The resistivity should be below the 1-square centimeter; below 10-6
2. In the production process, the PCB circuit board must go through the process manufacturing links such as copper plating, electroplating (or chemical plating, or hot tin spray), connector welding. The overall impedance is low, which meets the product quality requirements and can work normally
3. Tin -plated tin -plated circuit boards is the most common problem in the manufacturing process of the entire printed circuit board, and it is also a key link that affects impedance. The biggest defects of chemical tin plating are prone to discoloration (prone to oxidation or moisture) and poor weldability, which will make it difficult for the circuit board to weld, high impedance, poor conductivity, or unstable performance of the entire circuit board. Signal signal transmission. When the frequency must be increased to increase the transmission rate, the impedance value of the circuit itself will change due to different factors such as etching, layer pressure thickness, and wire width, which will distort signals and reduce the performance of PCB. Therefore, it is necessary to control the impedance value within a certain range.
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