Precautions For PCB Design And High-frequency Circuit Board Wiring

Precautions for PCB design and high-frequency circuit board wiring, follow Fanyi's technical staff

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 digitalization of signal transmission force PCB to move to microvias and buried/blind holes, wire thinning and uniform thin dielectric layer. High-frequency, high-speed, high-density multilayer PCB design technology has become an important research field. This article introduces the matters needing attention in PCB design and high-frequency circuit board layout, just follow KFPCBA's technical staff to have a look!

1 Reasonably choose the number of layers

In PCB design, when wiring high-frequency circuit boards, the middle inner plane is used as the power and ground layers to play a shielding role, effectively reduce parasitic inductance, shorten the length of signal lines, and reduce 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 wiring a high-frequency circuit board in PCB design, a high-frequency choke device should be connected when the digital ground, analog ground, etc. are connected to the common ground, usually a high-frequency ferrite bead with a wire in the center hole.

3 signal lines

When routing high-frequency circuit boards in PCB design, the signal routing cannot be looped, and it needs to be routed in a daisy-chain manner.

4 interlayer wiring directions

In PCB design, when wiring high-frequency circuit boards, the wiring 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 routing high-frequency circuit boards, the fewer the number of vias, the better.

6 copper clad

When wiring high-frequency circuit boards in PCB design, increasing the grounding copper can reduce the interference between signals.

7 decoupling capacitor

When wiring high-frequency circuit boards in PCB design, decoupling capacitors are connected across the power supply side of the integrated circuit.

8 trace length

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

9 packs

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

10 wiring method

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