Why Ceramic Capacitors Are Necessary in Circuits

1. Decoupling: Ceramic capacitors are called “decoupling” capacitors in the decoupling circuit. The decoupling function is naturally used to eliminate the coupling interference and the output signal interference.

2. Coupling: The coupling effect of the capacitor is mainly to prevent the quiescent operating points of the front and back two-stage circuits from interacting with each other, and the role of the capacitor is to pass the ac resistance, which is one of the most important characteristics of the capacitor.

3. Filtering: Filtering is a relatively important part of the use of a capacitor and is used in almost all power circuits. The higher the capacitance is, the easier it is for low frequency to pass. The smaller the capacitance is, the easier it is to pass the high frequency. Therefore, it can be concluded that the capacitor with a large capacity filters low frequencies and the capacitor with a small capacity filters high frequencies.

4. Energy storage: The main role of charge and discharge in the circuit.

5. Time constant: refers to the time required for over-reaction, mainly the size of the control time constant, so as to control the time of charge and discharge of the capacitor.

6. Neutralization: Capacitors used in neutralization circuits are called neutralization capacitors and are used in high frequency amplifiers for radios and televisions to eliminate self-excitation and oscillations.