PCB is called Printed Circuit Board, known as printed circuit board. It is the most basic component of electronic products, and almost all electronic devices will use PCB boards. The main function of the PCB board is to connect various electronic components through a conductive path to form a predetermined circuit connection. According to the number of layers, it can be divided into single panel, double panel and multi-layer board. When designing a PCB board, it is necessary to consider the layout of components, the layout of wires, the design of power supplies and ground wires, signal integrity, and so on. PCB board is an indispensable part of modern electronic equipment, and its design and manufacture has an important impact on the performance and reliability of the equipment.