[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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