Voltage-control attenuator

[Ching]

Does someone know how to make a voltage-controlled attenuator for a 100KHz signal?It would be better if the attenuation resolution is high, so that I can change the attenuation easily.

 

[shwoo]

Using a FET as a voltage variable resistor maybe a simple solution.
By changing gate bias you can vary the "resistance" between drain
and source. Hope this helps.
S. H.

 

[livemath]

Hi,

In addition to FET you can also use PIN diode. It is widely used for the design of Automatic Gaining Control as control element.


Goodluck...