贴片电容具有许多优点，比如能够抑制波纹、可靠性高、使用寿命长等等，那么贴片电容在电路线路中有哪些作用呢？

　　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：电容在去耦电路中被称为“去耦”电容，其发挥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声和输出信号的噪声。

　　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：用于中和电路的电容器被称为中和电容器，用于收音机和电视的射频波放大器，多用于消除自激和振荡现象。

　　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：电容的电容效应主要是防止两级电路的静态工作点相互作用，这是电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.储能作用：在储能方面，就是电池，电子产品中的电池实际上是一种电容，在电路中起着充放电的作用。

　　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.滤波作用：滤波是电容的作用中较为重要的一部分，基本上全部的电路上都会采用。电容器越大低频就越非常容易根据，电容器越小高频率就越非常容易根据，因而能够得到容积大的贴片电容率低頻，容积小的电力电容器滤高频率。

　　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.时间常数：时间常数是指过度反应所需的时间，主要是控制时间常数的大小，从而控制充放电时间。

　　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.