Not something I want to implement on short notice but maybe for the future.
The biggest limitation in this DIY PNA is the phase noise of the
reference OCXO and the noise of the opamp amplifying the output of the
mixer.
So I was wondering if it would make sense to do the following
1: Split the output of the DUT into two completely separate PNA's
2: Feed the output of the two PNA's into the PC left/right audio inputs
where the noise of both ADC's gets added.
3: Do a cross correlation of the two inputs.
This should (as far as I have understood the feedback) eliminate both
the phase noise of the two independent OCXO's used as reference and
eliminate the noise of the opamps in the two PNA's and the ADC's, given
enough time to do the correlation.
Erik.
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