On 10/11/19 11:25 PM, Anders Wallin wrote:
I am keen to measure close in phase noise 1Hz to 1 MHz offset on 100 MHz
clocks.
We have some preliminary results on 100MHz using an Ettus B210 SDR.
The RF front-end is an AD9361, and if you search on ebay you will find B210
clones at about half the NI/Ettus price (haven't tried those..)
The ADALM PLUTO has a AD9363 front end (single channel, Zynq backend)
and runs $99 (or $150) - I don't think it tunes down to 100 MHz, though.
One issue is ch1-to-ch2 isolation, which isn't stellar on the B210.
"isn't stellar" is sort of an understatement, and the USRPs also have
significant radiation of the clocks and LOs.
I'm sure John can enlighten us on the importance of channel isolation for
digital PN and ADEV measurements ;)
The brute-force approach may be to use two B210s in parallel?
gnu-radio is quite good for processing the samples - maybe the digilent or
red pitaya also have gnu-radio drivers?
AW
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