G
grittinjames
Guest
Hej,
Er muligt at variere Xtal frekvens smule af spænding?
Tak
Er muligt at variere Xtal frekvens smule af spænding?
Tak
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U
unkarc
Guest
Ja.Xtal oscillatorer hvis hyppighed kan blive kontrolleret af spænding kaldes VCXOs (Spændingsstyret Xtal oscillatorer).
Normalt varicap dioder anvendes til dette formål.Se nogle link på dette emne:
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
Normalt varicap dioder anvendes til dette formål.Se nogle link på dette emne:
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
F
FVM
Guest
For små variationer, en krystal oscillator med en ekstern "pull" varicap diode er en sædvanlig teknik.Du kan forvente flere 100 ppm maksimum, er tilstrækkelige til at justere en oscillator at den nominelle frekvens i en lille båndbredde PLL.
G
grittinjames
Guest
Hi FVM, forklares lidt dyb.
\
Tak
\
Tak
F
FVM
Guest
Se sædvanlige VXCO kredsløb,
f.eks side 5 i nedenstående Lineær Application Note:
http://www.linear.com/pc/downloadDocument.do?navId=H0, C1, C1154, C1002, C1223, P1240, D4108
f.eks side 5 i nedenstående Lineær Application Note:
http://www.linear.com/pc/downloadDocument.do?navId=H0, C1, C1154, C1002, C1223, P1240, D4108