What Should I Pay Attention To When Designing High Frequency Circuit Board Wiring in PCB Design?
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 PCB to move to micro-holes and buried/blind vias, thinner wires and uniformly thin dielectric layers. High-frequency, high-speed, high-density multilayer PCB design technology has become an important research field. This article introduces the precautions for PCB design and high-frequency circuit board wiring, just follow the technical staff of Taike Electronics to have a look!
1 Reasonably choose the number of layers
In PCB design, when wiring the high-frequency circuit board, 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 wiring high-frequency circuit boards in PCB design, high-frequency choke devices should be connected when digital ground, analog ground, etc. are connected to the common ground, which is generally a high-frequency ferrite bead with a wire through the center hole.
3 signal line
When wiring high-frequency circuit boards in PCB design, the signal wiring cannot loop, and it needs to be wired in a daisy chain manner.
4-layer wiring direction
In PCB design, when routing high-frequency circuit boards, the routing direction between layers should be vertical, that is, the top layer is horizontal and the bottom layer is vertical, so as to reduce interference between signals.
5 Number of vias
In PCB design, when routing high-frequency circuit boards, the smaller the number of vias, the better.
6 copper clad
When wiring high-frequency circuit boards in PCB design, adding grounded copper can reduce interference between signals.
7 Decoupling capacitor
When wiring high-frequency circuit boards in PCB design, connect decoupling capacitors across the power supply end of the integrated circuit.
8 trace length
When routing high-frequency circuit boards in PCB design, the shorter the trace length, the better, and the shorter the parallel distance between the two lines, the better.
9 packs of land
In PCB design, when wiring 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 wiring method
In PCB design, when wiring the 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.
