貼片電容具有許多優點，比如能夠抑制波紋、可靠性高、使用壽命長等等，那么貼片電容在電路線路中有哪些作用呢？

　　SMC has many advantages, such as ripple suppression, high reliability, long service life and so on. What are the functions of SMC in circuit?

　　1.去耦作用：電容在去耦電路中被稱為“去耦”電容，其發揮的作用是自然的去耦作用，主要是去除放大器中看不到的耦合噪聲和輸出信號的噪聲。

　　Decoupling effect: the capacitor is called "decoupling" capacitor in the decoupling circuit, and its role is natural decoupling, mainly to remove the coupling noise and output signal noise which can not be seen in the amplifier.

　　2.中和作用：用于中和電路的電容器被稱為中和電容器，用于收音機和電視的射頻波放大器，多用于消除自激和振蕩現象。

　　Neutralization: the capacitor used in neutralization circuit is called neutralizing capacitor. It is used in radio frequency wave amplifier of radio and television, and is mostly used to eliminate self excitation and oscillation.

　　3.耦合作用：電容的電容效應主要是防止兩級電路的靜態工作點相互作用，這是電容最重要的特性之一。

　　Coupling effect: the capacitance effect of capacitance is mainly to prevent the interaction of static working points of two-stage circuit, which is one of the most important characteristics of capacitance.

　　4.儲能作用：在儲能方面，就是電池，電子產品中的電池實際上是一種電容，在電路中起著充放電的作用。

　　Energy storage function: in terms of energy storage, it is the battery. The battery in electronic products is actually a kind of capacitor, which plays the role of charge and discharge in the circuit.

　　5.濾波作用：濾波是電容的作用中較為重要的一部分，基本上全部的電路上都會采用。電容器越大低頻就越非常容易根據，電容器越小高頻率就越非常容易根據，因而能夠得到容積大的貼片電容率低頻，容積小的電力電容器濾高頻率。

　　Filtering function: filtering is an important part of the function of capacitor, which can be used in almost all circuits. The larger the capacitor, the easier the low frequency will be. The smaller the capacitor, the easier the high frequency will be. Therefore, we can get the low frequency chip capacitance with large volume and filter the high frequency with small volume power capacitor.

　　6.時間常數：時間常數是指過度反應所需的時間，主要是控制時間常數的大小，從而控制充放電時間。

　　Time constant: time constant refers to the time required for overreaction, mainly to control the size of time constant, so as to control the charging and discharging time.