Uses and Functions of Typical Ceramic Capacitors (I)

Ceramic capacitors are used in a variety of ways and they have different functions in different circuits. What are the uses of our commonly used ceramic capacitors? What are their uses? For this editor, a detailed introduction is given. Let's take a look at the editors.

1) Coupling

When the ceramic capacitor is used for the coupling function, the DC component of the capacitor will not pass but this characteristic of the AC component will be fully utilized, and the AC component needs to be separated from the DC+AC component. Since the operating conditions of the active components such as transistors and ICs on the circuit are different, it is necessary to set the optimum operating conditions for each circuit and then separate out the required AC signals. The so-called coupling, meaning the combination of the circuit. As it literally means, coupling capacitors can be used in conjunction with circuits.

2) Decoupling

There are capacitance and inductance components in the power line on the circuit. Because of the influence of the power line, once the power line voltage fluctuates greatly, the operation of the circuit becomes extremely unstable. In extreme cases, power supply fluctuations will overlap on the signal lines and generate false signals. Therefore, a decoupling capacitor will be used in order to introduce disturbances flowing from the power supply to the ground and continue to provide a stable current for a sudden change in the load current of an element such as an IC. Even in the state where the interference overlaps, interference can be introduced to the ground portion by the decoupling capacitor.