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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!



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