• Resolved

RF 25 MHz programmable attenuator amplifier

Prodigy 80 points

Replies: 5

Views: 56

Hello,

We have a project with differential output DDS and need to create 2 channels with programmable amplitude. Could somebody recommend some good RF gain/attenuation buffering IC?

The specs I need to target are:

7 dBm to +23 dBm range, 50 Ω impedance

-13 dBm to +7 dBm range, 50 Ω impedance

On the DDS, I can vary the output full scale current with a resistor to get full scale output voltage of 62.5mV to 500mV into a 50 Ω load. You can see that I might be able to make it just with the current adjusting. I have not built the board yet and don't know how good this approach is. Still, any good chips out there?

dBm = 10*LOG10 (V^2  / (R * 0.001)

500mv-> 7.0dBm

62.5mV->-11dBm