source:Industry News release time:2021-12-06 Article author:sznbone Popular:pcb
In the transmission signal line of electronic devices, the resistance encountered when the high-frequency signal or electromagnetic wave propagates is called "impedance". In the production process, why some boards must have impedance, and what are the advantages of impedance PCB circuit boards!
1. It is necessary to consider plugging and installing electronic components, and the later SMT patch connection also needs to consider issues such as conductivity and signal transmission performance. , So the impedance is required to be as low as possible.
2. During the production process, the process of copper sinking, tin electroplating (or chemical plating, thermal spray tin), and connector soldering is experienced. The materials used must require low resistivity to ensure that the overall impedance value of the circuit board reaches the product quality Requirement for normal operation.
3. PCB tinning is the most prone to problems in the entire circuit board production, and it is the key link that affects the impedance; its biggest defect is easy to oxidize or deliquescence, poor brazing, making the circuit board difficult to solder, and the impedance is too high, thus Lead to poor electrical conductivity or instability of the overall board performance.
4. The conductors in the circuit board will transmit various signals. The circuit itself will change the impedance value due to factors such as etching, stack thickness, wire width, etc., which will distort the signal and cause the performance of the circuit board to decrease. Need to control the impedance value within a certain range.
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