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FPC soft plate impedance refers to the parameters of resistance and reactance, which hinder the AC power. Impedance is usually represented by Z, which is a complex number. The real part is called resistance, and the imaginary part is called reactance. The resistance of capacitance to alternating current in the circuit is called capacitive reactance. The resistance of inductance to alternating current in the circuit is called inductive reactance. The resistance of capacitance and inductance to alternating current in the circuit is called reactance.

The unit of impedance is ohm. In FPC circuit board with resistance, inductance and capacitance, the blocking effect on AC is called impedance. FPC circuit board impedance includes characteristic impedance, differential impedance, odd mode impedance, even mode impedance and common mode impedance. In production, impedance treatment is essential.

Purpose of soft board impedance

1. It is necessary to consider the installation of electronic components by plugging. After plugging, the electrical conductivity and signal transmission performance should be considered. Therefore, the impedance should be as low as possible, and the resistivity should be less than 1&TIMes: 10-6 per square centimeter.

2. In the production process, there are process manufacturing links, and the materials used in these links must ensure low resistivity to ensure that the overall impedance of the circuit board meets the product quality requirements and can operate normally.

3. There will be various signal transmission in the conductor. When the frequency must be increased in order to improve its transmission rate, if the line itself is different due to factors such as etching, stack thickness, wire width, etc., it will cause the impedance value to change, make its signal distortion, and lead to the degradation of the performance of the circuit board, so it is necessary to control the impedance value within a certain range.