China Wholesale Multilayer Flex Circuits Manufacturers - 4 Layer ENIG Impedance Control PCB 9115 – Huihe

About the impedance control

In the case of transmission of high frequency signals, the controlled impedance helps to ensure that the signal does not decay significantly during transmission. In essence, controlled impedance refers to the matching of the material properties of the substrate to the characteristics of the line/dielectric layer to ensure that the impedance value of the line signal is within the tolerance of the reference value. Controlled impedance PCBs provide reliable and consistent high frequency characteristics.

Applications of the impedance control

Internet box, TV, video game, digital camera, GPS

Analog and digital telecommunications

Computers, tablets, cell phones

Video signal processing

Motor control module

Relationship between characteristic impedance factors

From the perspective of PCB manufacturing, the key factors that affect the impedance are as follows:

- linewidth (W), the impedance decreases with the increase of linewidth.

- line distance (s), the impedance increases with the increase of distance.

- line thickness (T), the impedance decreases with the increase of line thickness.

- dielectric thickness (H), the greater the dielectric thickness, the greater the impedance.

- dielectric constant (DK), the higher the dielectric constant, the smaller the impedance.

Equipment display

Automatic Plating Line

PTH line

LDI

CCD Exposure Machine

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