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Re: [Discuss-gnuradio] Dynamic range of USRP2-XCVR2450
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From: |
Marcus D. Leech |
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Subject: |
Re: [Discuss-gnuradio] Dynamic range of USRP2-XCVR2450 |
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Date: |
Sun, 24 Oct 2010 13:57:19 -0400 |
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User-agent: |
Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.12) Gecko/20100907 Fedora/3.0.7-1.fc12 Thunderbird/3.0.7 |
On 10/24/2010 01:07 PM, Jorge Miguel wrote:
> Hello,
>
> I am trying to find out the minimum/maximun input power of the ADC
> LTC2284.
> I know that the maximum input voltage is 1 Volt, 0.707Vrms, but what
> is the input impedance? so that I can calculate the maximum input
> power as:
>
> minimum input power (SNR ADC) = Maximun input power
> ( [(0.707)/(2^14))^2]/Rin) + 72.4 dB = Maximun input power
>
> Am I right?
>
> Many thanks,
> Jorge
>
>
I believe that it's a 100ohm balanced input.
But the daughtercards all take a 50-ohm input, and convert to a balanced
output just before the
A/D.
With the exception of the Basic_RX and LFRX, the maximum input power for
any of the other
daughtercards is below -10dBm.
The BASIC_RX and LFRX have a maximum input power of about +10dBm.
--
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org