[time-nuts] Wikipedia and Residual Phase Noise

Magnus Danielson magnus at rubidium.dyndns.org
Mon Jul 13 15:24:16 EDT 2015


Dear Ulrich,

Indeed. I think it's really not meaningful of saying it is additive, 
just as it is not meaningful to say residual. Any buffering/amplifying 
stage will add phase noise (and amplitude noise). We will have 
conversion between AM and PM to some degree. For higher quality stuff, 
the levels are very low such that qualitative measurements becomes very 
hard, at least compared to oscillator measurements, also it is to it's 
nature a differential measurement, so the topology will be different.

The most sensitive measurements I've seen use interferometric or 
cross-correlation techniques, as Enrico shown. You have any further 
insights?

Cheers,
Magnus

On 07/13/2015 03:10 PM, KA2WEU--- via time-nuts wrote:
> This is a misnomer, it should be called "additive"phase noise. Think  of a
> "noise free" oscillator with a buffer stage. This stage because of AM/PM
> conversion under large signal condition adds noise, makes the over all system
> noisier..
>
> Ulrich Rohde
>
>
> In a message dated 7/13/2015 8:31:19 A.M. Eastern Daylight Time,
> timeok at timeok.it writes:
>
>
> Hi  all,
>
> I am looking on Wikipedia a description of the Residual Phase  Noise but
> this page do not exist.
> Can some one of the time-nuts expert  write a full description of this
> physical aspect for  Wikipedia?
>
> thanks,
>
> Luciano
> timeok at timeok.it
> www.timeok.it
>
>
> Message  sent via Atmail Open -  http://atmail.org/
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