[USRP-users] How is gain distributed?

Sivan Toledo stoledo at tau.ac.il
Sun Feb 10 01:52:37 EST 2013


Great, thanks a lot. Sivan

On Sun, Feb 10, 2013 at 8:41 AM, Josh Blum <josh at ettus.com> wrote:

>
>
> On 02/10/2013 12:32 AM, Sivan Toledo wrote:
> > My N200+WBX reports a gain range of 38dB, which consists of 31.5 in PGA0
> (a
> > frontend programmable attenuator), 6 in ADC-digital, and 0.5 in ADC-fine.
> >
> > When I set the gain to a given value, how does UHD distribute the total
> > gain between the gain elements? I could not find this in the sources (I
> > could not even find the strings "ADC-digital" and "ADC-fine" in the UHD
> > sources; perhaps they come from the FPGA image).
> > group
>
> The magic is hiding inside of multi_usrp.cpp
>
> So when setting the overall RX gain, the gain is first distributed to
> the RF frontend, then to the ADC. For TX, the gain is first distributed
> to the DAC, then to the  RF frontend.
>
> -josh
>
> > Thanks, Sivan
> >
> >
> >
> > _______________________________________________
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> > USRP-users at lists.ettus.com
> > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
> >
>
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