Attenuator is an electronic component that provides attenuation and is widely used in electronic devices. Its main purpose is to: (1) adjust the size of signals in circuits; (2) In the comparison method measurement circuit, it can be used to directly read the attenuation value of the tested network; (3) To improve impedance matching, if certain circuits require a relatively stable load impedance, an attenuator can be inserted between this circuit and the actual load impedance to buffer the changes in impedance