Its main role is to clear the various high frequency signal generated by the chip itself to other chips crosstalk, so that each chip module can not interfere with the normal work. In the high frequency electronic oscillation circuit, the patch type capacitor and the crystal oscillator together constitute the oscillation circuit, which can provide the required clock frequency to all kinds of circuits.
Chip capacitors are ceramic capacitors, chip capacitors, chip type aluminum electrolytic capacitors. Chip ceramic capacitors, the capacity is very small (PF), the general can be resistant to high temperature and voltage, commonly used in high frequency filter. The ceramic capacitor looks a bit like a patch resistor (so sometimes we also call it "patch capacitance"), but the patch capacitor does not represent the size of the number. Tantalum capacitors are characterized by long life, high temperature resistance, high accuracy, high filter frequency to change the performance of excellent, but the capacity is small, the price is more expensive than aluminum, and the ability to withstand voltage and current capacity is relatively weak. It is used in low frequency filter circuit with small capacity.
Compared with the ceramic capacitor, the surface of the chip has the capacity of capacitance and voltage, and the surface of the tantalum capacitor is usually yellow and black. The two kinds of color are yellow and black.
Patch type aluminum electrolytic capacitors have a larger capacity than the patch type tantalum capacitors, which is more common in the graphics card, the capacity of 300 mu F F~1500, which is mainly to meet the current low frequency filtering and voltage stabilizing effect.