In PCB design, wiring is a crucial step. Reasonable and effective wiring can ensure the stability and reliability of the circuit, and avoid the adverse effects caused by circuit wiring errors. When designing PCB wiring, certain rules and principles need to be followed. Below, we will introduce the six major wiring rules in PCB design.

Article 1: Classification based on transmission signal speed

     When wiring, it is necessary to classify the wiring according to the different signal transmission speeds. Generally speaking, signals with faster transmission speeds require shorter wiring distances to avoid distortion and interference during signal propagation. Therefore, when wiring, it is necessary to first determine which signals have faster speeds, and then place them closer  to the chip.

Article 2: Regional Layout

     For different functional modules, it is necessary to layout them in different regions and gather devices of the same function together for easy management and maintenance. When wiring, it is necessary to try to avoid cross wiring of different functions on the same layer, causing interference and signal distortion.

Article 3: Maintain Distance

     Maintain a certain distance between different signals to avoid crosstalk and mutual interference between them. For different signal types, the distance to be maintained needs to be determined based on their characteristics. For example, the distance between signals encountered on the same layer should be maintained at least 2mm, while the distance between the ground wire and the power wire can be slightly shorter.

Article 4: Prevention of excessive length and bending

     Long and tortuous routing can affect signal quality, leading to signal distortion and interference. In order to avoid this situation, it is necessary to try to avoid situations where it is too long or too curved. For certain lines that require bending, add transition curves at the bending point to alleviate electromagnetic fatigue.

Article 5: Layered Wiring

     For high-density PCB wiring, layered wiring is required. In this way, the wiring of different functional modules can be unloaded to different layers to avoid cross interference. At the same time, layering can also save a certain amount of space, making the PCB board more compact.

Article 6: Grounding Wiring

     In PCB design, ground wiring is a crucial aspect. For high-speed digital signals and analog signals, it is generally necessary to independently conduct ground wiring. Especially in situations where signal interference is severe, ground wiring can effectively reduce interference and noise.

     In short, the wiring in PCB design is very important and needs to follow some rules and principles. Among them, classification and regional layout are the most crucial two points, while also paying attention to maintaining distance, preventing excessive bending, layered wiring, and ground wiring. Only by strictly following these rules in PCB wiring design can the stability and reliability of the circuit be ensured.