Dear Ulrich,
Nice performance on your 10 GHz oscillator then!
I was not aware of that level of performance from a more regular
oscillator source.
Wish you luck with solving the power amplifier stage phase noise issue.
The FSWP is indeed a nice new box for the task. Wish I had one. Already
the FSUP was nice. These use dual channels and cross-correlation
techniques to the best of my knowledge.
I think maybe my point did not come through right.
The residual phase noise term refers more to the measurement setup
rather than the addition of noise. The term is troubled in that way.
I wonder if additive phase noise is the best term, but it is indeed
better. Also, as you say, we have noise conversion even in passive devices.
Cheers,
Magnus
On 07/14/2015 02:32 AM, [email protected] wrote:
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,
[email protected] 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,
> [email protected] 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
> [email protected]
> www.timeok.it
>
>
> Message sent via Atmail Open - http://atmail.org/
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