RE: [Discuss-gnuradio] USRP and XCVR2450 Noise Figure

[Per Zetterberg]

The main chip of the XCVR2450 is the MAX2829. The data sheet it says 3.5dB at a 
high gains settings. I think I recall obtaining something similar when I tested 
with sinusoids.

BR/
Per 
________________________________________
From: address@hidden address@hidden on behalf of Jeffrey Lambert address@hidden
Sent: Thursday, July 15, 2010 5:51 PM
To: address@hidden
Subject: Re: [Discuss-gnuradio] USRP and XCVR2450 Noise Figure

Hello,

The noise figure will in large part depend upon the receiver front-end
that is attached the USRP or in the daughter board that is used.  In
that case that you would like to know the noise figure of the USRP
without any RF front-end then the results may vary whether you are using
a BasicRX board or one of the LFRX boards.  For a 50 Ohm system, either
of these should yield accurate results.  Mainly, the noise figure of the
USRP will be derived from the AD9862 digitizer.  Since this IC contains
an amplifier, the noise figure will vary with the gain of the PGA.

I too am interested in measuring the noise figure of the USRP.  If you
are unable to find anything, I will be able to supply measurement data
within the next few weeks for a USRP device and BasicRX daughterboard.

~Jeffrey Lambert

On 7/15/2010 9:15 AM, address@hidden wrote:
> Hi,
>
> I was wondering if anyone found a datasheet of the USRP and/or XCVR2450
> which contain the Noise Figure of those devices, or at least of a
> combination of the two!?
>
> best and thanks a lot,
> Björn
>
>

--
~Jeffrey Lambert, K1VZX

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