![]() For instance, attenuators used with coaxial lines would be the unbalanced form while attenuators for use with twisted pair are required to be the balanced form.įour fundamental attenuator circuit diagrams are given in the figures on the left. These may be required to be balanced or unbalanced networks depending on whether the line geometry with which they are to be used is balanced or unbalanced. Attenuators are also used to 'match' impedance by lowering apparent SWR (Standing Wave Ratio).Īttenuator circuits π-type unbalanced attenuator circuit π-type balanced attenuator circuit T-type unbalanced attenuator circuit T-type balanced attenuator circuitīasic circuits used in attenuators are pi pads (π-type) and T pads. In measuring signals, attenuator pads or adapters are used to lower the amplitude of the signal a known amount to enable measurements, or to protect the measuring device from signal levels that might damage it. For higher frequencies precisely matched low VSWR resistance networks are used.įixed attenuators in circuits are used to lower voltage, dissipate power, and to improve impedance matching. Switching between different resistances forms adjustable stepped attenuators and continuously adjustable ones using potentiometers. ![]() ![]() An attenuator is sometimes referred to as a "pad" in certain fields.Īttenuators are usually passive devices made from simple voltage divider networks. While an amplifier provides gain, an attenuator provides loss, or gain less than 1. A 30 dB 5W RF attenuator, DC–18GHz, with N-type coaxial connectorsĪn attenuator is an electronic device that reduces the power of a signal without appreciably distorting its waveform.Īn attenuator is effectively the opposite of an amplifier, though the two work by different methods. ![]()
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