[time-nuts] Is oscillator sync always bad?

Predrag Dukic stijena at tapko.de
Thu Dec 18 21:29:37 UTC 2008




Bruce,

these articles are  more or less the  answer to my question.

In principle, there is obviously reduction in noise,  and the main 
concerns are uncoupled frequency difference and phase.

Thanks,

Predrag













At 21:48 18.12.2008, you wrote:
>Pedrag
>
>You may want to look at:
>
>http://my.ece.ucsb.edu/yorklab/Publications/BioBib/84%20-%20MTT%20May%201997%20Phase%20Noise.pdf
>
>http://repository.kulib.kyoto-u.ac.jp/dspace/bitstream/2433/49985/1/PhysRevLett_98_184101.pdf
>
>to get some idea of the complexities involved in such a scheme if you
>intend to reduce the phase noise of an ensemble of mutually coupled
>oscillators.
>
>Bruce
>
>Rick Karlquist wrote:
> > Some of Len Cutler's engineers at HP attempted to build
> > an ensemble of nine 10811 oscillators.  It was quite
> > non-trivial and I'm not sure they ever completed
> > the project.  I doubt whether just letting 10811's
> > self synchronize would result in satisfactory performance.
> >
> > Rick Karlquist N6RK
> >
> >
> > Predrag Dukic wrote:
> >
> >> Hi, Time -Nuts,
> >>
> >> Did anyone try to deliberately allow  syncronisation  of two
> >> oscillators, by , for example paralleling  outputs of two 10811.
> >>
> >> I expect to see some benefits from the usual statistics:   Phase
> >> noise divided by sqrt of 2    and also decreased  amplitude   random
> >> frequency jumps.
> >>
> >> Aging could also be average of the two.....
> >>
> >> Predrag Dukic
> >>
> >>
> >>
>
>
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