[time-nuts] Xtal Oscillator Aging
Tom Clark, W3IWI
w3iwi at toad.net
Mon Oct 24 14:40:31 EDT 2005
Brooke Clarke wrote:
Hi Tom:
This is the first I've heard about the cracks. Can you point me to
some literature about it so I can do my homework.
Thanks,
Brooke
Brooke -- My comment last nite was an attempted
simplification/synthesis of Vig's topics --- here are some references:
Vig is THE MAN WITH THE BIBLE
<[1]http://www.ieee-uffc.org/freqcontrol/quartz/vig/vigtoc.htm>.
Comments on the Quartz Crystal and how it works are in Section I at
<[2]http://www.ieee-uffc.org/freqcontrol/quartz/vig/vigqrtz.htm>.
Section III has relevant material on the aging process at
<[3]http://www.ieee-uffc.org/freqcontrol/vigaging91/introduc.htm>
Vig discusses all the mechanisms in
<[4]http://www.ieee-uffc.org/freqcontrol/vigaging91/agingmec.htm#Aging
%20Mechanisms.>. Note specially the sections on "Stress/Strain" ,
"Changes in the Quartz" and "Electrode Effects".
Temperature effects on aging are discussed here:
<[5]http://www.ieee-uffc.org/freqcontrol/vigaging91/temperat.htm#Tempe
rature%20and%20Temperature-Cycling>.
For a one-paragraph summary see the last paragraph of
<[6]http://www.ieee-uffc.org/freqcontrol/quartz/vig/vigaging.htm>
To back up my Power Level+S/N statements, see
<[7]http://www.ieee-uffc.org/freqcontrol/quartz/vig/vignoise.htm>
Vig's collected papers are $60 at
<[8]http://www.stormingmedia.us/16/1688/A168823.html>
There is also a good, old (1997, pre-Agilent) HP Application Note
200-2 which I found at
<[9]http://my.ece.ucsb.edu/yorklab/Useful%20Stuff/Tutorials/QuartzCrys
talOscillators.pdf>
Agilent (post-HP) has a good discussion on Precision vs Accuracy,
Aging etc at <[10]http://metrologyforum.tm.agilent.com/xtals.shtml>.
Hope I didn't confuse people with my simplified, one paragraph
explanations!
73, Tom Clark
References
Visible links
1. http://www.ieee-uffc.org/freqcontrol/quartz/vig/vigtoc.htm
2. http://www.ieee-uffc.org/freqcontrol/quartz/vig/vigqrtz.htm
3. http://www.ieee-uffc.org/freqcontrol/vigaging91/introduc.htm
4. http://www.ieee-uffc.org/freqcontrol/vigaging91/agingmec.htm#Aging%20Mechanisms.
5. http://www.ieee-uffc.org/freqcontrol/vigaging91/temperat.htm#Temperature%20and%20Temperature-Cycling
6. http://www.ieee-uffc.org/freqcontrol/quartz/vig/vigaging.htm
7. http://www.ieee-uffc.org/freqcontrol/quartz/vig/vignoise.htm
8. http://www.stormingmedia.us/16/1688/A168823.html
9. http://my.ece.ucsb.edu/yorklab/Useful%20Stuff/Tutorials/QuartzCrystalOscillators.pdf
10. http://metrologyforum.tm.agilent.com/xtals.shtml
Hidden links:
11. http://www.precisionclock.com/
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