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What practical PCB layout tips are worth sharing?
It is one of the important links in the process, which has a vital impact on the performance and reliability of the product. When doing PCB layout, following the 3W principles can help designers
Better understanding of layout requirements leads to better board design. Industrial Router/Gateway This article will introduce the specific content of the 3W principle in detail and discuss its application in circuit board design.
1. The definition of 3W principle
The 3W principle refers to "Wiring, Worship, Waste", that is, the three aspects of wiring, power supply and waste. Among them, "connection" refers to the signal transmission lines on the circuit board, including signal lines, power lines, ground wires, etc.; "power supply" refers to the power lines on the circuit board, including power input, power filtering, power distribution, etc.; And "waste" refers to the waste of space on the circuit board, including board size, device layout, line direction, etc. The three areas are interrelated, and problems in one area will affect the other two areas. Therefore, following the 3W principle can help designers better balance the relationship between these three aspects in circuit board design, so as to design a better circuit board.
2. Wiring
Wiring refers to the signal transmission lines on the circuit board, including signal lines, power lines, ground lines, etc. When designing a circuit board, the layout of the wiring is a very critical part. Good wiring layout can improve the reliability and performance of the circuit, and reduce the noise and interference of the circuit. When making wiring layout, the following points need to be paid attention to:
1. The length of the signal transmission route should be as short as possible, which can reduce signal interference and transmission errors.
2. The width and distance of the signal transmission route should be selected reasonably to ensure the stable transmission of the signal.
3. Signal lines and power lines should be separated from each other to avoid power noise
impact on signal transmission.
4. The signal line and ground line should be separated from each other to avoid the influence of ground line noise on signal transmission.
5. The layout of signal transmission routes should avoid crossings and loops to reduce signal interference and transmission errors.
3. Power supply (Worship)
Power supply refers to the power lines on the circuit board, including power input, power filtering, power distribution, etc. The layout of the power supply is a very important part of the circuit board design. When making power supply layout, the following points need to be paid attention to:
1. The power input should be concentrated in one position of the circuit board as much as possible for power filtering.
2. Power filter capacitor
It should be placed as close as possible to the power supply pins to improve the filtering effect.
3. Power distribution should be as balanced as possible to avoid power noise and overload problems.
4. Power distribution and signal lines should be separated from each other to avoid the influence of power noise on signal transmission.
5. The power line and ground line should be separated from each other to avoid the influence of ground line noise on the power supply.
4. Waste
Waste refers to the waste of space on the circuit board, including board size, device layout, line orientation, etc. Single serial port server Waste is also an area of concern when designing a circuit board. When laying out, you need to pay attention to the following points:
1. The size of the circuit board should be as small as possible to reduce material cost and layout complexity.
2. The layout of the device should be reasonable to reduce the length and complexity of the wiring as much as possible.
3. The distance between devices should be reasonable to avoid signal interference and transmission errors.
4. The direction of the line should be simple and direct to reduce signal interference and transmission errors.
5. The use of space should be sufficient to avoid large blank areas on the board.
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