[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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