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Solve PCB board laminate problems

September 26, 2022

  Senyan circuit board manufacturers exemplify some common problems of pcb laminates and related solutions. If you encounter common problems such as pcb board laminates, you should formulate a standard, and you can find the right remedy for such problems in the future.

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1. The flow direction should be scientific and reasonable
There are many aspects involved in this, such as high voltage/low voltage, input/output, strong/weak data signal, high frequency/low frequency and so on. The most reasonable direction of their flow should be linear and should not merge with each other. The principle to follow is to eliminate mutual interference. A more suitable flow direction is a straight line, but it is difficult to achieve. The most inappropriate flow direction is the loop, thankfully there is also the operation of isolation. If it is specifically aimed at DC, the design requirements of low-voltage PCB circuit boards can be lower. So the so-called "scientifically reasonable" is only relative.

2. Reasonable layout of power supply filter/decoupling capacitors
The layout of the PCB circuit board is critical to the appearance and performance of the entire circuit board. Only some of the power supply filter/decoupling capacitors are drawn in the schematic, but there is no clear indication of where they should be connected. I think those capacitors are set for switching devices or other components that require filtering/decoupling. The position of the capacitors should be close to those components, and the effect will not be found if they are separated by a long distance. When we rationalize the power supply filtering/decoupling capacitors, the common problems of grounding points don't seem to be prominent anymore. Everyone can try it out!

3. The grounding point is better
I don't need to say more about the importance of choosing a grounding point. It has been discussed by countless professionals, usually requiring standard co-location. For example, the multiple ground wires of the forward amplifier should be combined and then connected to the trunk ground and so on. But in real life, it is difficult to do it completely due to various types of constraints. But we cannot ignore it and should do our best to follow the principles. This common problem is very flexible in practice, and different people have different solutions. If it can be expressed specifically for a specific pcb circuit board, it is very easy to understand.


4. Reasonable selection of lines
It is called a circuit board. Of course, the lines are very important! If conditions permit, try to make the lines wider. High-voltage and high-frequency lines should be smoother without sharp chamfers. There should also be no 90° in turns, and the ground wire should be as wide as possible. To solve the problem of the grounding point, a better way is to pour a large area of ​​copper.
The problem of PCB circuit board is inseparable from design and circuit board processing. For example, problems that sometimes appear in post-production are likely to be caused by the design of the PCB. For example, too many wire holes, substandard copper sinking process, etc., can easily hide many hidden safety hazards. From the above problems, we can draw a conclusion that the wiring holes should be reduced as much as possible in the PCB circuit board design concept. If the number of parallel lines in the same direction is large and the density is high, they will be connected together during welding. Therefore, the welding level during production determines the size of the linear density. If the spacing of the solder joints is too small, the difficulty of manual welding will increase a lot. At this time, the only way to solve the welding quality is to reduce the work efficiency. Otherwise, there will be more and more problems in the future, and it will become more and more difficult to deal with. The skill and efficiency of the welder determines the narrowest pitch of the solder joints.