Many high-speed chip design instruction manuals with many pins will give the requirements for decoupling capacitors in power supply design. For example, a BGA package with more than 500 pins requires at least 30 ceramic capacitors for a 3.3V power supply, and several large ones. Capacitor, the total capacity should be more than 200uF. Capacitors play an important role in electronic circuits as basic components. In traditional applications, capacitors are mainly used for bypass coupling, power supply filtering, DC blocking, and oscillation and delay in small signals. With the development of electronic circuits, especially power electronic circuits, different special requirements have been put forward for capacitors in different applications.