[time-nuts] Low jitter oscillators

SAIDJACK at aol.com SAIDJACK at aol.com
Mon Aug 16 00:18:08 UTC 2010


Hi Attila,
 
note that manufacturers are kind of cheating when they say things like  
"0.2ps rms jitter" - see the N.S. appnotes below for example.

This is mostly calculated from phase noise, with typical bandwidth  limits 
of 20Hz to 20MHz or less.
 
So what happens below 20Hz or above 20MHz offset is usually ignored in this 
 number by filtering it out..
 
bye,
Said
 
 
In a message dated 8/15/2010 13:38:24 Pacific Daylight Time,  
charles_steinmetz at lavabit.com writes:

Attila  wrote:

>Does anyone have any pointers to recommended reading on the  design of such
>low jitter oscillators?

As Bruce noted, low  jitter oscillators are available from any number 
of sources.  If you  want to try rolling your own, here are a few 
sources to start you  off:

http://contentdm.lib.byu.edu/ETD/image/etd369.pdf

http://link.aip.org/link/?ELLEAK/34/2024/1

http://www.national.com/vcm/NSC_Content/Files/en_US/Timing/LMK04000_ProdBrie
f.pdf

http://www.national.com/an/AN/AN-1939.pdf

http://www.national.com/an/AN/AN-1910.pdf

I'm  sure others will have many more suggestions.

Best  regards,

Charles 



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