PCB Technical - The basic rules of wiring in PCB design.

In PCB design, wiring is an important step to complete product design. The design process of wiring has the highest limit, the finest skills, and the largest workload. It can be said that the previous preparations are done for it. PCB wiring is divided into three types: single-sided wiring, double-sided wiring and multilayer wiring. PCB wiring can use the automatic wiring and manual wiring provided by the system. Although the system provides the designer with an automatic wiring that is easy to operate and has a high routing rate, there are still unreasonable places in the actual design. At this time, the designer needs to manually adjust the wiring on the PCB to obtain the best The design effect.

The quality of PCB design has a great influence on its anti-interference ability. Therefore, in PCB design, the basic principles of the design must be observed, and the requirements of anti-interference design should be met, so that the circuit can obtain the best performance.

1. The layout of printed wires should be as short as possible; the address lines or data lines of the unified components should be kept as long as possible; when the circuit is a high-frequency circuit or the wiring is dense, the corners of the printed wires should be rounded, Otherwise it will affect the electrical characteristics of the circuit.

2. When double-sided wiring, the wires on both sides should be perpendicular to each other, obliquely crossed or bent to avoid parallel to each other to reduce parasitic coupling.

3. The PCB circuit board should try to use 45° fold lines instead of 90° fold lines to reduce the external emission and coupling of high-frequency signals.

4. The printed wires used as the input and output of the circuit should be avoided as far as possible to avoid backflow. It is best to add a grounding wire between these wires.

5. When there is a big difference in the density of the wiring on the board, it should be filled with a mesh copper foil with a grid size of 02mm (8mil).

6. Do not put through holes on the SMD pads, so as to avoid the loss of paste and cause false soldering of components.

7. Important signal wires are not allowed to pass through the sockets. Baineng.com is a subsidiary of Qinji Group and is a leading domestic electronic industry service platform. It provides online components, sensor procurement,PCB customization, BOM distribution, material selection and other electronic industry supply chain complete solutions, one-stop to meet the electronics industry The overall needs of small and medium-sized customers in the industry.

8. Avoid step-through holes under the components such as horizontal resistors, inductors (plug-ins), electrolytic capacitors, etc., so as not to be short-circuited between the holes and the component shells after peak soldering.

9. When wiring manually, lay out the power cord first, and then lay the ground wire, and the power cord should be on the same level as possible.

The above nine points are the basic rules of wiring in PCB design.