[time-nuts] Question on crystal jumps

[Joseph M Gwinn]

time-nuts-bounces at febo.com wrote on 10/23/2008 08:15:01 PM:

> Joseph M Gwinn wrote:
> > Would SAW oscillators be better than crystals?
> >
> > Joe
> >
> >
> > 
> They still rely on using a piezoelectric crystal as does a BAW
> oscillator.
> There's no reason to believe that they would be immune to frequency 
jumps.

Reminds me of popcorn noise in semiconductors.  It turned out to be caused 
by impurities in the materials, and has largely been solved by process 
improvements.

SAWs are made by a very different process than bulk crystals, so one may 
get lucky. 


> It may be better (aside from costs) to just use a very large sapphire
> whispering gallery resonator.

A higher frequency could be an advantage in the "crystal" oscillator of a 
Rb oscillator.  One can then divide the higher frequency down to 10 MHz, 
perhaps improving phase noise in the process.

I suppose a SAW could be made of sapphire, if it's piezeoelectric enough.

Joe


> Bruce
> 
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