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| Crystal Equivalent Circuit - RF Cafe Forums | ||||||
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Below are all of the forum threads, including all the responses to the original posts. 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 Top 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 Top 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. Top 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 Top 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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