The handling of power supply and ground wire is well done even if the wiring in the entire PCB is well done, but the interference caused by the inconsiderate consideration of power supply and ground wire will degrade the performance of the product, and sometimes even affect the success of the product Rate. Therefore, the wiring of the power and ground wires should be taken seriously, and the noise interference generated by the power and ground wires should be minimized to ensure the quality of the products. For every engineer engaged in the design of electronic products, the ground wire and the ground wire should be understood. Causes of noise between power lines.