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​Why does the resistor produce noise during use?
Feb 22, 2018

Why does the resistor produce noise during use?


The resistor produces noise during operation, and the noise of the resistor is an irregular voltage fluctuation that occurs in the resistor. Resistor It includes thermal noise depending on the attached value and resistance body temperature, and current noise due to current work.

  Current noise is usually a type of noise generated when a direct current passes through a resistor consisting of a discontinuous conductor (ie, a granular conductor). This is also called excess noise because it is the extra noise that comes out of the resistor's basic thermal noise. Thermal noise is present in all resistances due to the irregular thermal mass of conductive electrons in the resistor. Irregular thermal conduction of conductive electrons will cause fluctuations in the current. Although this current fluctuations are very weak. But still in the ground resistance between any two points in the formation of small irregular changes in voltage. Thermal noise is a specific reflection of this irregular current and voltage changes.

  For noise control, wirewound resistors are the best choice, followed by metal film, metal oxide, carbon film, and finally carbon core. However, the high resistance of wirewound resistors is rare and inductive and in some cases it can cause instability.