For the record: I got my hands on a second B210, and I can confirm that,
in terms of keeping the center frequency synced, the B210+B210+Octoclock
combination indeed performs much better than the B205mini+B210+Octoclock
combination. Thanks for the insights!
Viktor
On 6/4/21 9:31 PM, Brian Padalino wrote:
On Fri, Jun 4, 2021 at 2:21 AM Viktor Erdelyi
<vik...@ist.osaka-u.ac.jp <mailto:vik...@ist.osaka-u.ac.jp>> wrote:
You're right Marcus, 0.9GHz seems to be better indeed (see image).
Also thanks for the input on the B205 PLL.
May I ask in what way phase noise can affect the signal's
frequency? According to an NI webpage [1], it "deals with very
short time scales and produces effects that look more like
unwanted modulation changing the shape of the waveform rather than
a wandering frequency". Am I missing something?
It should be noted the B205 doesn't really have an analog PLL like the
B200/B210/X-series. Check the schematic:
https://files.ettus.com/schematics/b200mini/b200mini.pdf
<https://files.ettus.com/schematics/b200mini/b200mini.pdf>
The VTCXO is fed by a 16-bit DAC and the FPGA does some counting to
try to keep it locked, but it doesn't have the feedback loop that the
actual analog PLL does.
Kind of comparing apples with oranges at that point.
Brian
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