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Impedance PCB refers to the PCB board that needs impedance control. Impedance PCB control means that under a high frequency signal, the "resistance" generated by a certain line layer to its reference layer in the transmission must be controlled within the rated range, so as to ensure that the signal will not be distorted in the transmission process. PCB impedance control is to make every part of the system have the same impedance value, that is, impedance matching. So, what factors are related to Impedance PCB?
From the perspective of PCB manufacturing, the main factors affecting Impedance PCB and key factors are as follows:
The impedance of PCB becomes smaller (W.
2. With the increase of distance (s), the impedance increases.
3. With the increase of wire thickness (T), the impedance decreases.
4. The dielectric thickness of PCB board (H), the larger the dielectric thickness, the greater the impedance.
5. The dielectric constant (DK) of PCB board, the larger the dielectric constant, the smaller the impedance.
Note: in fact, the solder mask of PCB also affects the impedance, but the dielectric constant increases because the solder mask is attached to the dielectric, which is attributed to the influence of dielectric constant, and the PCB impedance value will be reduced by 4%.
