[time-nuts] Low jitter oscillators
Bob Camp
lists at rtty.us
Mon Aug 16 00:35:44 UTC 2010
Hi
The bandwidths chosen generally have roots in a telcom spec. Infinite bandwidth generally equates to infinite jitter. You have to restrict it somehow.
Bob
On Aug 15, 2010, at 8:18 PM, SAIDJACK at aol.com wrote:
> 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
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>
More information about the time-nuts
mailing list