2007/7/10, Eric Cottrell <[EMAIL PROTECTED]>:
Hello,
The LFRX daughterboard on the USRP has 20 dB of gain. I seem to remember that
10 dB of that gain is from the FPGA. I assume that this gain is after the ADC?
If so, is it really useful?
I relate digital gain to zoom on a digital camera. The analog gain is the
optical zoom and the digital gain is the digital zoom. Digital cameras have
10x or more digital zoom but it is not really useful. At high digital zooms
you get lower resolution and the picture is blocky. Optical zoom is more
useful as it comes before the digitizer.
So if I have noise values of 35 and signal values of 40 then I get values of
350 and 400 after the 10 dB digital amplifier. I may see a higher amplitude
signal but how do I gain anything? Am I missing something?
73 Eric
Hi Eric,
The ADC has a programmable gain stage prior to sampling. Could it be
that one you are thinking of?
Regards,
--
Trond Danielsen
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