FPC circuit board for impedance purposes

The impedance of the FPC board refers to the resistance and the parameters of the reactance, which hinder the AC. The impedance is usually expressed by Z, which is a complex number. The real part is called a resistor, and the imaginary part is called a reactance. The blocking effect of the capacitor on the alternating current in the circuit is called the capacitive reactance. The inductance acts on the alternating current in the circuit. For inductive reactance, the blocking effect of capacitors and inductors on the AC in the circuit is collectively called reactance.

    The unit of impedance is Europe. In the FPC circuit board circuit with resistance, inductance and capacitance, the blocking effect on the alternating current is called impedance. The impedance of the FPC board has characteristic impedance, differential impedance, odd-mode impedance, even-mode impedance. Common mode impedance. Impedance processing is essential in FPC board production. The reasons are as follows:

    1. FPC circuit board should consider plugging and mounting electronic components. After plugging, consider the conductive performance and signal transmission performance. Therefore, the lower the impedance, the better the resistivity should be less than 1/TImes per square centimeter: 10-6 or less. .

    2, FPC circuit board in the production process to go through the process of production, and the materials used in these links must ensure low resistivity, in order to ensure that the overall impedance of the circuit board meets product quality requirements, can operate normally.

    3. There are various signal transmissions in the conductors in the FPC circuit board. When the transmission rate is increased, the frequency must be increased. If the line itself is different due to etching, laminate thickness, wire width, etc., the impedance value will change. The signal is distorted, resulting in reduced performance of the board, so it is necessary to control the impedance value within a certain range.