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  • Chip capacitance

    Source: Time:2019-03-19 16:38:40 frequency:

    The basic function of a capacitor is to store the charge, which is common in analog and digital circuits and has no substitute effect. As a basic component in a circuit, a capacitor has several uses:

    The basic function of a capacitor is to store the charge, which is common in analog and digital circuits and has no substitute effect. As a basic component in a circuit, a capacitor has several uses:
    1, filtering
    Filtering is an important application. In simple terms, when the input voltage in the circuit is higher than the voltage across the capacitor, the charge will enter the capacitor, forming a charge, and the capacitor voltage will increase. The charging takes time. When the input voltage drops, the charge will flow out and form. Discharge. The charging and discharging time is related to the capacitance value and the circuit resistance. The larger the capacitance, the longer the charging point time. In the circuit, large-capacity electrolytic capacitors are often used for filtering, and the longer the charging and discharging time, the more severe voltage changes can be withstood.
    Here is an analogy:
    The input voltage is a small river, the waves are turbulent (mistaken), flowing into the large reservoir (capacitor), there is a lot of water in the reservoir, the waves of the small river are too small inside, the river has risen and fallen, and it will be absorbed by the reservoir, so the reservoir flows out. Water, very calm, no waves (smooth output voltage)
    With the charge and discharge of the capacitor, the unstable input voltage will become a relatively stable output voltage, thus achieving filtering.
    2, DC blocking
    The capacitor has a direct blocking effect on the direct current, which means that no current flows in the circuit after the direct current is charged to the capacitor. When the DC power supply is applied to the capacitor, there is current flowing in the circuit. This current is the charging current to the capacitor. The current flow process will soon end. The specific length of time is related to the size of the resistors and capacitors in the circuit. The larger the product of the larger the size, the longer the charging time, and vice versa. After charging is complete, the voltage across the capacitor is equal to the DC supply voltage.
    3, bypass capacitor
    The capacitor used in the bypass circuit is called a bypass capacitor, and the bypass capacitor is a capacitor that bypasses the high-frequency component of the alternating current mixed with the high-frequency current and the low-frequency current, and is called a "bypass capacitor." For the same circuit, the bypass capacitor is used to filter the high-frequency noise in the input signal, and the high-frequency noise carried by the pre-stage is filtered out.
    4, decoupling
    Decoupling capacitors, also called decoupling capacitors, use the interference of the output signal as a filtering object. The decoupling capacitor is used in the amplifier circuit where no AC is needed to eliminate self-excitation and stabilize the amplifier.
    5, energy storage
    Store energy and release it slowly/slowly. For example, instant high temperature sterilization, as well as the camera's flash.


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