The resistance encountered during the propagation of high-frequency signals or electromagnetic waves in electronic device transmission signal lines is called "impedance". Why do some boards require impedance during the production process, and what are the advantages of impedance PCB circuit boards!

　　1. It is necessary to consider the installation of electronic components through plug connections, and later SMT patch connections also need to consider issues such as conductivity and signal transmission performance, so the lower the impedance, the better.

　　2. During the production process, the materials used must have low electrical resistivity to ensure that the overall impedance value of the circuit board meets the product quality requirements and can operate normally.

　　3. PCB tin plating is the most common problem in the production of the entire circuit board, and it is a key link that affects impedance; Its biggest defects are easy oxidation or deliquescence, poor solderability, making it difficult to solder the circuit board, high impedance, and resulting in poor conductivity or unstable overall board performance.

　　4. The conductors in the circuit board will transmit various signals, and the impedance value of the circuit itself may change due to factors such as etching, layer thickness, and wire width, causing signal distortion and a decrease in the performance of the circuit board. Therefore, it is necessary to control the impedance value within a certain range.

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