Gayathri,
You can find IIP2, IIP3, and NF data for the N210 with WBX (on the receive
side) here:
http://files.ettus.com/performance_data/wbx/wbx_imd_and_nf_vs_gain.pdf
Please let me know if you have any questions about the data.
Thanks,
Matt
On Wed, Apr 16, 2014 at 10:22 AM, Gayathri Ramasubramanian
<grama...@vt.edu>wrote:
> Hi
>
> My project is dealing with Tx/Rx Characterization. I wanted to know if
> anyone has tried finding the IIP3 and OIP3 for the USRP N210 with WBX and
> SBX daughter-boards.
> I did an experiment on Tx side ( USRP behaving as a TX, with the GRC on
> host generating the two tones & output from USRP goes to an attenuator of
> 10 db before going to a spectrum analyzer) and got the following results.
> (as in the excel sheet attached.)
> I am planning to do this for the RX side using Two signal generators
> instead of the GRC flow graph. However I had a few questions:
>
> 1. I found the IIP3 for SBX to be given as 0 dBm & for WBX as 50 ~ 100 dBm
> on receive, What is it for Tx?
> 2. Usually IIP3 and OIP3 are said to have more importance on the RX side,
> to measure non-linearity. Do IIP3 and OIP3 hold same significance on TX
> side? if not, what could be judged as a good measure of non linearity for
> TX side.
> 3. In this test, When I increase the amplitude of the signals, o/p varies.
> But for SBX the Inter-mods appear at 250mV while for WBX it is ard 550mv,
> and here the plot is very unsteady, and the NF is seen as curving.
> however if I do the test with attenuation as 30 dB before the spectrum
> analyzer, The plot has a steady NF. Also after a certain point, I see a lot
> of spurious signals. Is there a specific amplitude range I should
> constraint myself to, to get the IIP3 and OIP3 points.
>
>
>
> Thanks
> Gayathri
>
>
> _______________________________________________
> Discuss-gnuradio mailing list
> Discuss-gnuradio@gnu.org
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>
>
_______________________________________________
Discuss-gnuradio mailing list
Discuss-gnuradio@gnu.org
https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
