On 2022-08-12 08:49, zhou via USRP-users wrote:
Hi,
I have general question on power control in USRPs. I know the gain
range is from 0dB - 30dB. How is gain control realized, by using
active amplifier or adjusting passive attenuators?
Thanks,
Hongwei
RF gain control is nearly *ALWAYS* through variable attenuators, and in
USRPs, it's no different.
You can adjust the gain a little on RF amplifiers by playing with bias
voltages, but doing so nearly always
results in other important properties (like linearity and noise
figure) being negatively affected. So, you
optimize the bias to achieve a balance of "good" properties, and then
use a variable attenuator if you
need variable gain.
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