On 20/11/2024 05:02, Marcus Müller wrote:
Depends on the gain you set, and the frequency you're working on. I
wish I could give you a simple number or even just a graph over gain,
but it's necessarily a two-parameter thing. You will have to measure.
At max gain, you'd expect full scale output to be achieved deeeeep in
the negative dBm.
Best regards,
Marcus Müller
I'll augment what my colleague has said.
The amount of gain in the path will vary over frequency--perhaps by a
few dB. But also from device to device,
by 1-2dB.
The "gain" setting doesn't actually tell you anything about total RF
gain between antenna and ADC. It's a
"gain control" setting, which in RF paths is nearly-always
implemented with distributed attenuators. The
total gain ahead of the ADC may be more or less than 72dB. If the
total path is gain at "MAX" is 50dB,
then that 72dB gain-control range takes you down to a spot where you
have -22dB of gain.
If your goal is to estimate the power at the antenna port using a
strictly "numerical" approach based on the
gain setting, you are in a state of sin. You MUST calibrate over
your entire expected operating space,
including center frequency and sample rate, and at various gain
settings (although the gain setting should
be largely linear).
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