FPC circuit board impedance refers to the parameters of resistance and reactance, which hinder the alternating current. 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 blocking effect of capacitance on alternating current in circuit is called capacitive reactance. The blocking effect of inductance on alternating current in circuit is called inductive reactance. The blocking effect of capacitance and inductance on alternating current in circuit is called reactance.
The impedance is in Europe. In FPC circuit with resistance, inductance and capacitance, the blocking effect on AC is called impedance. FPC board impedance has characteristic impedance, differential impedance, odd mode impedance, even mode impedance and common mode impedance. In FPC circuit board production, impedance treatment is essential. The reasons are as follows:
1. FPC circuit board should consider the installation of electronic components, and after the plug-in, the electrical conductivity and signal transmission performance are considered. Therefore, the lower the impedance is, the better, and the resistivity is lower than 1-ti per square centimeter mes:10-6 following.
2. FPC circuit board must experience process production in the process of production, and the materials used in these links must ensure low resistivity, so as to ensure 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 of FPC circuit board. When the transmission rate is increased, the frequency must be increased. If the circuit itself is different due to etching, lamination thickness and wire width, the impedance value will be changed, and the signal distortion will be caused, which will lead to the decline of the performance of the circuit board. Therefore, it is necessary to control the impedance value in a certain range.