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  • What is the use of chip capacitors in the circuit?

    Source: Time:2019-03-19 16:34:11 frequency:

    The role of chip capacitors in the circuit is very important. As the technology becomes more and more intelligent, the capacitors used in the circuit board are gradually degraded. As the technology evolves into a precision device, it can be filtered and decoupled in the circuit. The main purpose of coupling, oscillation timing and other capacitors. Let's take a look at the contents of the small series.

    The role of chip capacitors in the circuit is very important. As the technology becomes more and more intelligent, the capacitors used in the circuit board are gradually degraded. As the technology evolves into a precision device, it can be filtered and decoupled in the circuit. The main purpose of coupling, oscillation timing and other capacitors. Let's take a look at the contents of the small series.
    The capacitive reactance of the chip capacitor changes with the frequency of the alternating current applied at both ends, Z=1/2*3, 14*FC. Set the different capacitance values according to which frequency the current needs to be filtered out. This allows the unwanted current to be directed to ground and the filtering is completed. For currents of the desired frequency, the capacitance is either path or impedance is small. When AC power is passed, it is a process of repeated charging and discharging.
    Decoupling capacitors, filter capacitors, bypass capacitors, what are the roles, differences, and connections?
    What is the use of chip capacitors? For example, the emitter of a transistor amplifier has a self-biased bias resistor, which at the same time causes the voltage drop of the signal to be fed back to the input to form an input-output signal coupling. This resistor is the component that produces the coupling, if a parallel connection is made across the resistor. Capacitor, because the appropriate capacity of the chip capacitor to the AC signal with a small impedance (which needs to be calculated) thus reduces the coupling effect of the resistor, so the capacitor is called a decoupling capacitor.
    Bypass capacitors are not a theoretical concept, but a practical method that is often used. In the 1950s and 1960s, the term had its own meaning, and it is not used much now. The tube or transistor needs to be biased, which is the DC supply condition that determines the operating point.
    For example, the gate of the electron tube is required to be negatively charged with respect to the cathode. In order to operate under a direct current power source, a resistor is connected in series from the cathode to the ground, and a positive potential of the cathode is formed by the plate current, and the gate is grounded. This biasing technique is called “self-biasing”, but for (AC) signals, this is also a negative feedback. To eliminate this effect, connect a large enough point in parallel with this resistor. This is called Road chip capacitors. Later, some materials extended it to similar situations.
    What are the characteristics of chip capacitors?
    1, small size, easy to SMT processing, good solderability, compared to other traditional plug-in capacitors to solve the problem of small space on the circuit board, is a representative product of high-tech products.
    2, long life, international uniform standards for the life of the product is ten years.
    3, good stability, reflected in a stable requirement for high-frequency capacitor capacity and withstand voltage.
    4, green environmental requirements, because high-frequency capacitors are made of ceramics as raw materials, and achieved environmental protection and energy conservation.
    5, good thermal insulation performance, because it is made of ceramic materials, it is a natural material for thermal insulation.


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