The TDEV plot for the OCXO in question which can be derived from its
ADEV plot is perhaps a useful guide to the expected jitter when
measuring a particular time interval.
For long time intervals the phase noise much closer to the carrier than
5Hz will tend to dominate.
Bruce
Bob Camp wrote:
Hi
Single cycle jitter is a bit confusing when you talk about bandwidths of 5Hz
to 20 MHz off a carrier. Since phase noise at 5 Hz does contribute to jitter
over that bandwidth, an OCXO (with good phase noise close in) would be
needed.
Bob
-----Original Message-----
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Attila Kinali
Sent: Monday, August 16, 2010 11:53 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] OT: leaching was, Alternative time interval
interpolation technique
On Mon, 16 Aug 2010 07:58:01 +1200
Bruce Griffiths<bruce.griffi...@xtra.co.nz> wrote:
Such low jitter oscillators are readily available.
With some care (bandpass filtering) a cycle to cycle jitter of around
50fs or so is attainable with a Wenzel OCXO for example.
Apropos Wenzel: Is there any distributor that sells them in
single quantities? Or do i have to get them from Wenzel directly?
And is there any price list available?
However the time interval jitter degrades as the time interval increases.
Achieving a cycle to cycle jitter of 1ps or so is relatively easy with a
10MHz or 100MHz OCXO having sufficiently low phase noise.
Why an OXCO? AFAIK the temperature has only an effect on long term
stability/drift, but doesn't affect short term effects (which cause
the jitters). Or am i missing something?
Attila Kinali
_______________________________________________
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
