Azelio Boriani wrote:
and not having a -175dBc/Hz reference, how you can tell that your dual
-150dBc/Hz performs like a -170dBc/Hz?
You can't.
Moreover: what is the physical principle that can explain this? Injection
locking?
Not injection locking just the magic of cross corrrelation.
Only the phase noise that is common to both measurement channels
remains after sufficient averaging.
Average in the power summer? Taking hundreds or thousands
oscillators it seems possible to reach astonishing levels...
Bruce
On Sun, Dec 30, 2012 at 10:44 AM, Bruce Griffiths<
bruce.griffi...@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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