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Single Layer Capacitor and Decoupling
2021/05/28 03:05:00

Single layer capacitor produced by EXSENSE Electronics Technology Co., Ltd. have the advantages of small size (minimum size can be 0.23mm), thin thickness (thinnest thickness can be 0.12mm), low equivalent series resistance and low loss, which can be used in microwave applications for DC isolation, RF bypass, wave filtering, tuning and other functions.

Small capacitors filter out high frequencies, large capacitors filter out low frequencies. In order to achieve better filtering effect, the general input power supply or output power supply will adopt a large capacity capacitance plus a small capacity capacitance (such as 1uF+0.1uF). Bypass is generally located at the signal input end, decoupling is generally located at the signal output end. What the bypass filters is the interference of the former power supply, which is generally high frequency noise. A small capacitance capacitor is added to the input power supply pin, such as the common 0.1uF. Decoupling filters out the interference of the output stage, due to the output stage acts as the input of the next stage. The first function of decoupling is the same as the bypass, high frequency filtering. The second is to act as an energy storage capacitor, which provides electric energy when the load required current suddenly increases to meet the current changes of the driving circuit. The larger the capacitor is, the more energy is stored, and within a certain range, it is more effective to meet the load current changes.

So, what's the difference between decoupling and bypass? The process of filtering out the high frequency components of the input signal is called Bypass. Decoupling, refers to the interference of output signal as the filter object. By comparison, we can see that both the bypass capacitor and the decoupling capacitor act as filters, but their positions on the circuit are different.

Regarding the decoupling radius of the capacitor, the decoupling path of the capacitor with small capacity value is short. If it exceeds the decoupling path, the decoupling effect will be lost, so it is generally placed close to the Integrated Circuit (IC). Large capacitance capacitor has long decoupling path and relatively loose placement. So electricity usually goes through a large capacitor, and then through a small capacitor, and then into an integrated circuit chip.

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