It refers to the parameters of resistance and reactance in the PCB board. It mainly hinders the alternating current. In the production process of the circuit board, impedance processing is inevitable. So why does the reactance hinder the current? Why do we need a reactance?
1. In the production process, the circuit board has to go through the process of copper sinking, electroplating tin, and connector soldering. The materials used in these links must ensure low resistivity to ensure that the overall impedance of the circuit board is low to meet the product quality requirements and operate normally.
2. Tinning is the most prone to problems in the production of the entire circuit board, and it is a key link that affects the impedance. The biggest drawbacks are easy discoloration (both easy to oxidize or deliquesce), poor solderability, which will lead to difficult soldering of circuit boards, high impedance, poor electrical conductivity, or instability of overall board performance.
3. There are various signal transmissions in the conductors of the circuit board. When the frequency must be increased in order to increase its transmission rate, if the circuit is different due to factors such as etching, stack thickness, wire width and other factors, the impedance value will change, distorting its signal, resulting in a decrease in the performance of the circuit board, so it is necessary to control the impedance value within a certain range.
4. In the process, do we have to consider installing components? After plugging in, we must consider the electrical performance and signal transmission issues, so at this time, the lower the impedance, the better.
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