What Should Be Paid Attention to in Layout of High-frequency PCB, SYS Tech-China PCB Factory_

What Should Be Paid Attention to in Layout of High-frequency PCB


High-frequency, high-speed, and high-density have gradually become one of the important development trends of modern electronic products. The high-frequency and high-speed digitization of signal transmission force the PCB to move toward micro-holes and buried/blind vias, thinner wires, and evenly thin dielectric layers. High-frequency, high-speed, high-density multilayer PCB design technology has become an important research field. This article China High frequency PCB manufacturer- SysPCB introduces the precautions for PCB design and high-frequency circuit board layout.

 

1. Reasonably choose the number of layers

In PCB design, when layout the high-frequency circuit boards, the middle inner plane is used as the power and ground layer to play a shielding role, effectively reducing parasitic inductance, shortening the length of signal lines, and reducing cross-interference between signals. Generally speaking, the noise of a four-layer board is 20dB lower than that of a two-layer board.

 

2. High-frequency choke

When layout high-frequency circuit boards in PCB design, high-frequency choke devices should be connected between digital ground and analog ground. Which is generally a high-frequency ferrite bead.

 

3. Signal line

When layout high-frequency circuit boards in PCB design, the signal layout cannot loop, and it needs to be wired in a daisy chain manner.

 

4. Interlayer layout direction

In PCB design, when layout high-frequency circuit boards, the layout direction between layers should be vertical, that is, the top layer is horizontal and the bottom layer is vertical, which can reduce the interference between signals.

 

5. Number of vias

In PCB design, when layout high-frequency circuit boards, the smaller the number of vias, the better.

 

6. Copper clad

When layout high-frequency circuit boards in PCB design, adding grounded copper clad can reduce interference between signals.

 

7. Decoupling capacitor

When layout high-frequency circuit boards in PCB design, connect decoupling capacitors across the power supply pin of the integrated circuit.

 

8. Layout length

When layout high-frequency circuit boards in PCB design, the shorter the wire length, the better, and the shorter the parallel distance between the two lines, the better.

 

9. Wrapping ground

In PCB design, when layout high-frequency circuit boards, wrapping important signal lines can significantly improve the anti-interference ability of the signal. Of course, it can also wrap the interference source so that it will not interfere with other signals.

 

10. Layout method

In PCB design, when layout the high-frequency circuit boards, the layout must be rotated at an angle of 45°, which can reduce the transmission and mutual coupling of high-frequency signals.