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grittinjames
Joined: 01 Jun 2006
Posts: 380
Helped: 7
Location: bangalore india
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 25 Sep 2008 12:48 Xtal frequency!!!!!!! |
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Hi,
Is possible to vary Xtal frequency slightly by voltage?
Thanks
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unkarc
Joined: 28 Apr 2001
Posts: 286
Helped: 36
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| 25 Sep 2008 14:16 Re: Xtal frequency!!!!!!! |
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Yes. Xtal oscillators whose frequency can be controlled by voltage are called VCXOs (voltage controlled Xtal oscillators).
Usually varicap diodes are used for this purpose. See some link on this topic:
http://www.valpeyfisher.com/images/other%20pdfs/application%20notes/vcxowhitepaper.pdf
http://www.maxim-ic.com/appnotes.cfm/appnote_number/2097
http://www.tlsi.com/images/AN-104%20T231%20Tuning.pdf
rgds, unkarc
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FvM
Joined: 22 Jan 2008
Posts: 2635
Helped: 431
Location: Bochum, Germany
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| 26 Sep 2008 7:11 Re: Xtal frequency!!!!!!! |
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| For small variations, a crystal oscillator with an external "pull" varicap diode is a usual technique. You can expect several 100 ppm maximum, sufficient to adjust an oscillator to it's nominal frequency in a small bandwidth PLL.
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grittinjames
Joined: 01 Jun 2006
Posts: 380
Helped: 7
Location: bangalore india
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| 03 Oct 2008 12:53 Xtal frequency!!!!!!! |
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Hi FVM,Please explain little deep .
\
Thanks
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FvM
Joined: 22 Jan 2008
Posts: 2635
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Location: Bochum, Germany
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