Anti-interference design principles of printed circuit boards

by:A-TECH      2021-03-27
After the printed circuit board is designed, it will encounter a lot of interference, just like a mobile phone signal. After interference, it will naturally affect the user experience. Therefore, anti-interference is very important. How should we resist interference and what are the anti-interference? The principle, I will introduce you to it next. 1 The wires used for the input and output terminals should be avoided as far as possible. It is better to add ground wires between the wires to avoid feedback coupling. 2 The minimum width of the printed wire is mainly determined by the adhesion strength between the wire and the insulating substrate and the flow through them. The current value determines when the thickness of the copper foil is 0.05mm and the width is 1~15mm, the current temperature through 2A will not be higher than 3, so the wire width of 1.5mm can meet the requirements. For integrated circuits, especially digital circuits, the wire width of 0.02~0.3mm is usually selected. Of course, as long as it is allowed or as wide as possible, especially the minimum spacing between the power line and the ground wire is mainly determined by the worst-case insulation resistance and breakdown voltage. For integrated circuits, especially digital circuits, as long as the process allows, the spacing can be small. The turn of the printed wire to 5~8mm3 generally takes a circular arc shape and a right angle or an included angle will affect the electrical performance in the high-frequency circuit. In addition, try to avoid the use of large area copper foil, otherwise the copper foil will expand and fall off when heated for a long time. It is best to use a grid shape when using a large area of u200bu200bcopper foil. This is beneficial to eliminate the volatile gas generated by the heating of the adhesive between the copper foil and the substrate
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