[time-nuts] Wikipedia and Residual Phase Noise

[KA2WEU at aol.com]

Dear Magnus,
 
With your kind permission I (totally ) disagree with you . We make 10 GHz  
oscillators which are almost getting close to the Poseidon Sapphire , but  
the post power amplifier 
at 10 Ghz has a much higher noise floor then the source . I have not yet  
solved the problem 
 
My new FSWP (R&S) Analyzer can measure down to - 190dBc/Hz .
 
Wish me luck, Ulrich   
 
 
In a message dated 7/13/2015 5:29:50 P.M. Eastern Daylight Time,  
magnus at rubidium.dyndns.org writes:

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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