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Crystal Equivalent Circuit - RF Cafe Forums
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darcyrandall2004
Post subject: Crystal Equivalent Circuit Posted:
Tue Jul 08, 2008 6:42 pm
Colonel
Joined: Tue Feb
27, 2007 6:16 am
Posts: 46
Hello,
I wish to design and
simulate a crystal oscillator. I have been having great difficulty obtaining
typical crystal equivalent circuit values for whatever frequency.
Can anyone suggest a manufacturer that lists the equivalent
circuit values for each of their crystals?
Other than measuring
the values, is there an easier way of obtaining typical crystal equivalent
circuit values?
Thankyou
_________________
Regards,
Darcy Randall, Perth, Western Australia
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nubbage
Post subject: Posted: Wed Jul 09, 2008 4:12 am
General
Joined: Fri Feb 17, 2006 12:07 pm
Posts: 218
Location:
London UK
Hi Darcy
you will find the equivalent circuit and
much useful data on www.euroquartz.co.uk
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markapexwireless
Post subject: Posted: Wed Jul 09, 2008 11:40 am
Captain
Joined: Tue Jul 08, 2008 7:15 pm
Posts: 11
Location: Boulder
Colorado
Hi Darcy,
Most manufacturers will specify Rm (series
resistance at resonance), Co (holder capacitance) and of course Fo,
so all you really need to complete basic model is either Cm, Lm or Q.
Frerking lists the following typical Qs:
200 KHz Fundamental
- 18e3
2 MHz Fundamental - 54e3
30 MHz 3rd Overtone - 1e5
90 MHz 5th Overtone - 85e3
Many manufacturers will allow
you to specify Cm or Lm, but this is not typically specified on data
sheet since it makes little difference for clock oscillator, where most
crystals are used, and it would add cost to actually measure it in manufacturing.
Hope this helps.
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darcyrandall2004
Post subject: Posted: Wed Jul 09, 2008 6:35 pm
Colonel
Joined: Tue Feb 27, 2007 6:16 am
Posts: 46
Very Helpful,
I have what I need. Cheers
_________________
Regards, Darcy
Randall, Perth, Western Australia
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IR
Post
subject: Posted: Thu Jul 10, 2008 3:41 pm
Site Admin
Joined: Mon Jun 27, 2005 2:02 pm
Posts: 373
Location: Germany
Hi Darcy,
Try also Fox Elecctronics: http://www.foxonline.com/
They have detailed specifications for their crystals and good
application notres on their website. I had the sdame problem as you
and they helped me a lot.
Good luck!
Posted 11/12/2012
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