How to select Variable RF Attenuators
Variable attenuators, like the name suggests are attenuators whose attenuation can be changed by varying the voltage or current to the device. These are used in application where it is required to continuously vary the signal level.
Frequency (MHz): This is the frequency range over which the variable attenuator can operate while keeping its attenuation in a specific range.
Attenuation Range (dB): This is the ratio of the output and input power levels. The level of attenuation for variable attenuators can be varied by voltage or current.
Power (W): The level of power that a variable attenuator can handle
Impedance (Ohms): The impedance of an attenuator must match the circuit/system it is connected to; this will minimize any reflection within the circuit/system. Usually the impedance is 50 Ohms or 75 Ohms.
Package Type: RF Variable Attenuators are available in a number of package types. The package type usually depends on how the attenuation is regulated. Voltage variable attenuators can be connectorized or surface mount devices.