modify the AD9361 simulink model to look at LNA output?

I'd like to be able to look at the output of the LNA in the AD9361 Simulink model. I've been able to modify the model to get the output from the IQ demod, but no further back towards the receive antenna. The issue is that when I take the output from the LNA, I still get the spectrum from roughly -5.5 to +5.5MHz. I'm not sure how to set the spectral display. It seems that the issue is with the inherited sample rate in the spectral display, but I don't see how to adjust that.

One other question. In the LNA, I see that NF (noise figure) is used as a variable to set the noise contribution of the LNA, but I don't see where in the model where NF is actually defined/quantified.

thanks,

Steve

Parents
  • Can you indicate the block at the output of which you are connecting the spectrum analyzer.

    As for the NF variable, it can be found as follows. Right click RF_RX block, select Mask->View Mask. Then select Initialization tab in the Mask Editor. You'll find NF extrapolated from the noise figure values in the datasheet using interp1 MATLAB function.

    - Srikanth

Reply
  • Can you indicate the block at the output of which you are connecting the spectrum analyzer.

    As for the NF variable, it can be found as follows. Right click RF_RX block, select Mask->View Mask. Then select Initialization tab in the Mask Editor. You'll find NF extrapolated from the noise figure values in the datasheet using interp1 MATLAB function.

    - Srikanth

Children