What design principles should PCB follow?

What design principles should PCB follow?
With the rapid development of science and technology, the upgrading of electronic products is getting faster and faster. Practice has proved that even if the circuit schematic is correctly designed and the printed circuit board is improperly designed, the reliability of electronic equipment will be adversely affected. What design principles should PCB follow?
PCB design principles

1. Ground wire design
In electronic equipment, grounding is an important method to control interference. If the grounding and shielding can be correctly combined, most interference problems can be solved. Attention shall be paid to the following points in the design of ground wire:
(1) Correct selection of single point grounding and multi-point grounding;
(2) Separate digital circuit from analog circuit;
(3) The grounding wire shall be thickened as much as possible;
(4) Make the grounding wire into a closed loop.
2. EMC design
The purpose of EMC design is to enable electronic equipment to suppress all kinds of external interference, enable electronic equipment to work normally in a specific electromagnetic environment, and reduce the electromagnetic interference of electronic equipment to other electronic equipment.
(1) Select reasonable wire width
The inductance of a printed wire is proportional to its length and inversely proportional to its width, so a short and precise wire is beneficial to interference suppression.
(2) Use the right cabling strategy
The inductance of conductors can be reduced by using equal routing, but the mutual inductance and distributed capacitance between conductors increase; If the layout allows, it is better to adopt the well shaped mesh wiring structure.
(3) Suppress reflection interference
In order to suppress the reflected interference at the terminals of printed lines, except for special needs, the length of printed lines should be shortened as much as possible and slow speed circuits should be used.
PCB design principles
3. Decoupling capacitor configuration
In DC power supply circuit, the change of load will cause power supply noise. Decoupling capacitors can be configured to suppress noise caused by load changes.
4. Dimensions of printed circuit board and configuration of components
In terms of device layout, as with other logic circuits, the devices related to each other should be placed as close as possible, so as to obtain better anti noise effect. Devices, small current circuits, large current circuits, etc. that are easy to generate noise shall be as far away from logic circuits as possible.
5. Thermal design
From the perspective of facilitating heat dissipation, it is better to install printed boards vertically, and the distance between boards should generally not be less than 2cm. A lot of practical experience shows that the temperature rise of printed circuit can be effectively reduced by adopting a reasonable device arrangement.
The above is the explanation given by the editor of pcb circuit board company. If you want to know more about PCBA, you can go to our company's home page to learn about it. In addition, our company also sells various circuit boards,
High frequency circuit board and SMT chip are waiting for your presence again.