Aug. 09, 2023
The capacitors with these three names are actually filters, but they are used in different circuits, and the names and usages are different.
Filter Capacitor
This is the capacitor we usually use after power rectification. It is a capacitor that rectifies the AC rectification circuit into pulsating DC and smoothes it through charging and discharging. This capacitor is generally an electrolytic capacitor with a large capacitance, at the microfarad level.
Bypass Capacitor
It is to filter out the high-frequency components in the input signal. It is mainly used to filter out high-frequency clutter. Usually, ceramic capacitors and polyester capacitors are used. The capacitance is small, at the picofarad level.
Decoupling Capacitor
It is to take the interference of the output signal as the filtering object, and the decoupling capacitor is equivalent to the battery, which is used to charge and discharge, so that the amplified signal will not be disturbed by the sudden change of the current. Its capacitance depends on the frequency of the signal and the degree of suppression of ripples.
This article is provided by JYH HSU Electronics (also Dongguan Zhixu Electronics), an original manufacturer of electronic components such as capacitors and resistors.
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