Hi all,
I've spent some time this summer as part of a radar project digging into
calculating phase noise for highly stable tones. I have implemented what
I think is a decent algorithm. My next steps are to look for test data
sets and tips for the hardware.
Do you have a file of samples of a stable tone? If anyone has a test
data set consisting of samples of a pure tone that they would like to
share as a test data set, I'd like to apply my codes to that and check
the phase noise. Both the tone generator and the ADC sample clock should
be phase stable to the order of a Keysight signal generator, or ideally
better. The data set length should be a reasonable fraction of a second
for ~1 Hz phase noise resolution. The frequency of the tone and the
sample rate are fairly arbitrary as I'm mainly looking to benchmark the
algorithm.
How cheaply can stable samples be acquired? I'm looking for low cost
hardware (a few $100s up to a few $k) that is stable enough to measure
phase noise comparable to a Keysight source or better. Phase noise can
be measured with an expensive phase noise analyzer, but I believe it
should be possible to do this with a low cost digitizer with a suitably
stable sample clock. The sample clock could (or perhaps must) be
external. The sample rate should be around 80-100 Msps or higher and the
platform should be able to store a burst of samples of length on the
order of 1 sec. We have done this using a ZCU 216 and it seems to work,
but that isn't really a low cost board. I've looked into Picoscope
products, which might be ideal, but their support people don't know
anything about the phase noise properties of their samplers.
Thanks in advance to anyone whose interest is piqued enough to respond.
Best,
Karl
--
Karl F. Warnick
Parkinson Engineering Research Professor
Department of Electrical and Computer Engineering
Brigham Young University
450 Engineering Building
Provo, UT 84602
(801) 422-1732
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