[time-nuts] Ultra low phase noise floor measurement system for RF devices.
Dr Bruce Griffiths
bruce.griffiths at xtra.co.nz
Sun Apr 1 00:30:31 EDT 2007
Magnus Danielson wrote:
> In the article that was recently referred to, it was not a measurement rig for
> oscillators but for transfer components, such as gain-stages, phase shifters
> etc. and the approach is different then, since you do have the signal prior to
> being dirtyfied. Thus, the interferometer approach makes sense. The refinement
> was certainly interesting.
>
> Cheers,
> Magnus
>
Hej Magnus
What about a 3 source version of the following with the oscillator under
test common to both channels together with using the cross spectrum to
isolate the noise due to the oscillator under test. (of course phase
locking the 2 other oscillators to the reference using a very low
bandwidth loop may also be required).
http://www.femto-st.fr/~rubiola/journal-articles/rubiola2003ell-low-signal-power-interferometer.pdf
<http://www.femto-st.fr/%7Erubiola/journal-articles/rubiola2003ell-low-signal-power-interferometer.pdf>
Bruce
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