The characteristics of monolithic capacitors: good temperature characteristics, good frequency characteristics. Generally, as the frequency increases, the capacitance of the capacitor decreases. The monolithic capacitor decreases less and the capacity is relatively stable.
The role of monolithic capacitors
1. Energy storage exchange
This is the most basic function of the monolithic capacitor, which is mainly used to generate and release electrical energy through its charge and discharge process. This is mainly based on large-capacity type II monolithic capacitors, and in some cases can even replace small aluminum electrolytic capacitors and tantalum electrolytic capacitors.
2. Separate direct communication (bypass and coupling)
Since the monolithic capacitor is not a conducting body, it reflects the phenomenon of electrification at both ends through the regular rotation of the AC. Therefore, it can be connected in parallel with other components in the circuit to allow the AC to pass through and the DC to be blocked. , Play a bypass role.
In an AC circuit, the monolithic capacitor is charged and discharged following the change in the polarity of the input signal, so that the circuit connected to the two ends of the monolithic capacitor is in a conductive state and acts as a coupling.
Generally speaking, the monolithic capacitor connected to the input of the amplifier or op amp is a coupling monolithic capacitor; the monolithic capacitor connected to the emitter of the amplifier or op amp is a bypass monolithic capacitor.
Both of them are mainly type II monolithic capacitors, especially 0.1uF capacitors.
3. Frequency discrimination filtering
In an AC circuit, for a multi-frequency mixed signal, we can use a monolithic capacitor to separate its parts. Generally speaking, we can use a monolithic capacitor with a reasonable capacitance to filter out most of the low-frequency signals. This is mainly based on high frequency or ultra high frequency monolithic capacitors.
4. Suppression of surge voltage
Because the monolithic capacitor is an energy storage element, in the circuit, it can remove those short-term surge pulse signals, and can also absorb the excess energy generated by the voltage fluctuations in the circuit. The filtering is mainly based on high-frequency products .
