Monolithic capacitor is another name for multi-layer ceramic capacitor, abbreviated as MLCC

Monolithic capacitor is another name for multi-layer ceramic capacitor, abbreviated as MLCC, widely used in electronic precision instruments. Various small electronic devices are used for resonance, coupling, filtering, and bypass.

The basic structure of a simple parallel plate capacitor is composed of an insulated intermediate dielectric layer and two conductive metal electrodes. The basic structure is as follows:

Therefore, the structure of multi-layer chip ceramic capacitors mainly includes three parts: ceramic dielectric, metal inner electrode, and metal outer electrode. The multi-layer chip ceramic capacitor is a multi-layer stacked structure, which is simply a parallel combination of multiple simple parallel plate capacitors.

characteristic

Good temperature and frequency characteristics. Generally, as the frequency increases, the capacitance shows a decreasing pattern, while the single stone capacitance decreases relatively little and the capacity is relatively stable.

effect

1. Energy storage exchange

This is the most basic function of a single stone capacitor, mainly through its charging and discharging process to generate and discharge an electrical energy. This is mainly the class II monolithic capacitor with large capacity. In some cases, it can even replace the small Aluminium electrolytic capacitor and tantalum electrolytic capacitor.

2. Direct communication (bypass and coupling)

Due to the fact that a single stone capacitor is not a conductive body, it reflects the phenomenon of electrification at both ends through the regular rotation of AC, it can be connected in parallel with other components in the circuit to allow AC to pass through, while DC is blocked, serving as a bypass.

In an AC circuit, a single stone capacitor charges and discharges according to the polarity change of the input signal, resulting in a conductive state of the circuit connecting the two ends of the single stone capacitor, playing a coupling role.

Generally speaking, the single stone capacitor connected to the input end of an amplifier or operational amplifier is a coupled single stone capacitor; The single stone capacitor connected to the amplifier or operational amplifier emitter is a bypass single stone capacitor.

Both are mainly composed of Class II single stone capacitors, especially capacitors of 0.1uF.

3. Frequency discrimination filtering

In AC circuits, for a multi frequency mixed signal, we can use a single stone capacitor to separate its parts. Generally, we can use a reasonable capacitance of a single stone capacitor to filter out most of the low-frequency signals. This is mainly based on high-frequency or ultra-high-frequency single chip capacitors.

4. Suppression of surge voltage

Due to the fact that a single stone capacitor is an energy storage component, it can remove transient surge pulse signals and absorb excess energy generated by voltage fluctuations in the circuit. Filtering is mainly focused on high-frequency products.