What are the important parameters of high-speed and high-frequency PCB boards?

The production process of high-speed and high-frequency PCB boards is basically the same as that of ordinary PCB boards. The key point to achieve high frequency and high speed lies in the properties of raw materials, that is, the characteristic parameters of raw materials. The main material of high-speed and high-frequency PCB boards is high-frequency and high-speed copper-clad boards. The core requirement is to have low dielectric constant (Dk) and low dielectric loss factor (Df). In addition to ensuring low Dk and Df, the consistency of Dk parameters is also one of the important factors to measure the quality of high-speed and high-frequency PCB boards. In addition, another important parameter is the impedance characteristics of the PCB board and some other physical properties.

The dielectric constant (Dk) of the high-frequency and high-speed PDB board substrate must be small and stable. Generally speaking, the smaller the better. The signal transmission rate is inversely proportional to the square root of the material dielectric constant. High dielectric constants are prone to cause signal transmission delays.

The dielectric loss (Df) of the substrate material of high-frequency and high-speed PCB boards must be small, which mainly affects the quality of signal transmission. The smaller the dielectric loss, the smaller the signal loss.

The impedance of high-frequency and high-speed PCB boards actually refers to the parameters of resistance and reactance. Impedance control is the most basic principle for our high-speed design, because PCB circuits must consider the installation of electronic components, and after the installation, the conductivity and signal transmission performance must be considered. Therefore, the lower the impedance, the better. Generally, major board manufacturers will ensure a certain degree of impedance error during PCB processing.

===================================================================================

Copyright statement: The copyright of the information in this article belongs to the original author and does not represent the views of this platform. It is for sharing only. If there are copyright and information errors involved, please contact us to correct or delete it. Thanks!