High-speed PCB Design Guide High-speed PCB Design Guide Part 1 PCB Routing In PCB design, routing is an important step to complete product design. It can be said that all the previous preparations are done for it. In the entire PCB, the design process of routing has the highest restrictions, the most delicate skills, and the largest workload. PCB routing includes single-sided routing, double-sided routing, and multi-layer routing. There are also two ways of routing: automatic routing and interactive routing. Before automatic routing, you can use interactive routing to pre-route the lines with stricter requirements. The edge lines of the input and output ends should avoid adjacent parallel to avoid reflection interference. If necessary, ground isolation should be added. The wiring of two adjacent layers should be perpendicular to each other. Parallel routing is prone to parasitic coupling. The routing rate of automatic routing depends on a good layout. The routing rules can be set in advance, including the number of bends of the routing, the number of vias, the number of steps, etc. Generally, exploratory routing is performed first to quickly connect the short lines, and then maze routing is performed. The wiring path of the connection to be routed is optimized globally. It can disconnect the routed lines as needed. And try to re-route to improve the overall effect. The through hole is not suitable for the current high-density PCB design. It wastes a lot of precious wiring channels. To solve this contradiction, blind hole and buried hole technology have emerged. It not only completes the function of the through hole, but also saves a lot of wiring channels to make the wiring process more convenient, smoother and more complete. The design process of the PCB board is a complex and simple process. In order to master it well, it is necessary for the majority of electronic engineering designers to experience it by themselves to get the true meaning. 1. Processing of power and ground wires Even if the wiring in the entire PCB board is completed well, the interference caused by the inconsiderate consideration of the power and ground wires will reduce the performance of the product and sometimes even affect the success rate of the product. Therefore, the wiring of the power and ground wires should be taken seriously to minimize the noise interference generated by the power and ground wires to ensure the quality of the product. Every engineer engaged in the design of electronic products understands the cause of the noise between the ground wire and the power wire. Now we will only describe the noise reduction method: (1) It is well known that decoupling capacitors are added between the power and ground wires. (2) Try to widen the width of the power and ground wires. It is best if the ground wire is wider than...
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