Variable Attenuators

Variable attenuators are a type of radio frequency attenuator that permits the signal level to constantly change. Attenuators are devices that decrease the power of a signal without noticeably distorting its waveform. This protects circuitry from receiving a signal that’s too powerful. 


Variable attenuators are used when the signal level needs to be able to change frequently. This is useful when you don't know exactly what the final desired signal range is or when accuracy is not a priority. Attenuators can be thought of as the opposite of signal amplifiers. An amplifier increases signal power (or amplitude) while an attenuator decreases it. 


How do variable attenuators work?

The signal level of variable attenuators is altered either manually or remotely. 


In manual variable attenuators, the signal level is changed by physically controlling the device, using something like an adjustable screw control.


If they are controlled remotely, a motor or PIN diode uses variable voltage to change the signal.


Types of variable attenuators 

Variable attenuators come with PIN diodes or MESFETs (metal–semiconductor field-effect transistors) as resistors to modulate amplitude. They can use either balanced or unbalanced pi-pad or T-pad circuits. 


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Omschrijving Prijs Maximum Attenuation Maximum Frequency Maximum Insertion Loss Mounting Type Package Type Pin Count Dimensions Length Width Height Maximum Operating Supply Voltage Maximum Operating Temperature Minimum Operating Supply Voltage Minimum Operating Temperature
RS-stocknr. 145-1329
FabrikantnummerHMC624ALP4E
FabrikantAnalog Devices
7,088 €
Each (On a Reel of 50)
Aantal stuks
31.5dB 6GHz 3.8dB Surface Mount SMT 24 4.1 x 4.1 x 0.95mm 4.1mm 4.1mm 0.95mm 5 V +85 °C - -40 °C
RS-stocknr. 139-1741
FabrikantnummerHMC425ALP3E
FabrikantAnalog Devices
20,553 €
Each (On a Reel of 18)
Aantal stuks
31.5dB 8GHz 4.7dB Surface Mount QFN 16 3 x 3 x 0.85mm 3.1mm 3.1mm 0.85mm 5 V dc +85 °C 3 V -40 °C
RS-stocknr. 183-2510
FabrikantnummerHMC973ALP3E
FabrikantAnalog Devices
12,17 €
Each
Aantal stuks
31dB 5GHz 5.6dB Surface Mount SMT 16 3.1 x 3.1 x 0.95mm 3.1mm 3.1mm 0.95mm 5 V +85 °C - -40 °C
RS-stocknr. 183-2446
FabrikantnummerHMC802ALP3E
FabrikantAnalog Devices
5,115 €
Each (In a Pack of 2)
Aantal stuks
20dB 10GHz 3.5dB Surface Mount SMT 16 3.1 x 3.1 x 0.95mm 3.1mm 3.1mm 0.95mm 5 V +85 °C - -40 °C
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