Don't underestimate small capacitor
s. His role is very big. Have you ever used his electronic products? . If you don’t use it well, you can die ugly everywhere, so first introduce the function of the capacitor as one of the passive components. Its function is nothing more than the following: 1. Used in the power circuit to achieve bypass, The role of capacitors in decoupling, filtering and energy storage are detailed in the following categories: 1) Filtering and filtering is a very important part of the role of capacitors. It is used in almost all power circuits. Theoretically (that is, assuming that the capacitor is a pure capacitor), the larger the capacitance, the smaller the impedance, and the higher the passing frequency. But in fact, most of the capacitors over 1uF are electrolytic capacitors, which have a large inductance component, so the impedance will increase when the frequency is high. Sometimes you will see a large electrolytic capacitor with a small capacitor connected in parallel. At this time, the large capacitor passes through the low frequency and the small capacitor passes through the high frequency. The function of the capacitor is to pass high impedance and low impedance, and pass high frequency to block low frequency. The larger the capacitance, the easier it is to pass low frequencies, and the larger the capacitance, the easier it is to pass high frequencies. Specifically used in filtering, a large capacitor (1000uF) filters low frequencies, and a small capacitor (20pF) filters high frequencies. Some netizens once compared the filter capacitor to a 'pond.' Since the voltage across the capacitor does not change suddenly, it can be seen that the higher the signal frequency, the greater the attenuation. It can be vividly said that the capacitor is like a pond and will not change the amount of water due to the addition or evaporation of a few drops of water. It converts changes in voltage into changes in current. The higher the frequency, the greater the peak current, thus buffering the voltage. Filtering is the process of charging and discharging. 2) Bypass Bypass capacitor is an energy storage device that provides energy for local devices. It can uniformize the output of the regulator and reduce the load demand. Just like a small rechargeable battery, the bypass capacitor can be charged and discharged to the device. In order to minimize the impedance, the bypass capacitor should be as close as possible to the power supply pin and ground pin of the load device. This can well prevent the ground potential rise and noise caused by the input value being too large. The ground bounce is the voltage drop at the ground connection when a large current burr passes. 3) To remove the lotus root, also known as the solution of lotus root. From the circuit point of view, it can always be divided into the driving source and the driven load. If the load capacitance is relatively large, the drive circuit must charge and discharge the capacitance to complete the signal jump. When the rising edge is relatively steep, the current is relatively large, so that the drive current will absorb a large power supply current. Inductance,
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