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An attenuator is a circuit used to introduce a predetermined attenuation in a specified frequency range. It is usually marked by the number of decibels introduced and the characteristic impedance of the ohms. Attenuators are widely used in CATV systems to meet the requirements of multi port to level. Such as the input of the amplifier, the control of the output level and the control of the branch attenuation. Attenuator has passive attenuator and active attenuator two kinds. The active attenuator is combined with other heat sensitive components to form a variable attenuator, which is used in an amplifier for automatic gain or slope control circuits. The passive attenuator has a fixed attenuator and an adjustable attenuator.