[time-nuts] ensemble oscillators for better stability

Azelio Boriani azelio.boriani at screen.it
Sun Dec 30 13:32:35 UTC 2012

and not having a -175dBc/Hz reference, how you can tell that your dual
-150dBc/Hz performs like a -170dBc/Hz?
Moreover: what is the physical principle that can explain this? Injection
locking? Average in the power summer? Taking hundreds or thousands
oscillators it seems possible to reach astonishing levels...

On Sun, Dec 30, 2012 at 10:44 AM, Bruce Griffiths <
bruce.griffiths at xtra.co.nz> wrote:

> Tom Knox wrote:
>> Dual oscillators in Cross Correlated
>> measurements will also produce a 3dB theoretical reduction in a Phase
>> Noise measurement system.
> Since when?
> Its way better than that.
> I routinely achieve a PN floor below -170dBc/Hz (I don't have an OCXO with
> a phase noise floor below ~ -175dBc/Hz) using a pair of oscillators each
> having a PN floor (~ -150dBc/Hz) well above that
> Bruce
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