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https://designers-guide.org/forum/YaBB.pl Design >> Analog Design >> question about crystal oscillator https://designers-guide.org/forum/YaBB.pl?num=1237343129 Message started by hyy95 on Mar 17th, 2009, 7:25pm |
Title: question about crystal oscillator Post by hyy95 on Mar 17th, 2009, 7:25pm Hi, I have some questions about the feedback resistor in the pierce oscillator setting: why can it force the transistors into active region? why it's value should be high? how does a low value Rf degrade the frequency stability? how does a low value Rf increase the current? how can we find the best value of Rf? Thanks |
Title: Re: question about crystal oscillator Post by pancho_hideboo on Mar 17th, 2009, 9:10pm hyy95 wrote on Mar 17th, 2009, 7:25pm:
hyy95 wrote on Mar 17th, 2009, 7:25pm:
hyy95 wrote on Mar 17th, 2009, 7:25pm:
hyy95 wrote on Mar 17th, 2009, 7:25pm:
hyy95 wrote on Mar 17th, 2009, 7:25pm:
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Title: Re: question about crystal oscillator Post by hyy95 on Mar 17th, 2009, 9:25pm hyy95 wrote on Mar 17th, 2009, 7:25pm:
I don't get this one, can you explain more details? Thanks! hyy95 wrote on Mar 17th, 2009, 7:25pm:
Why won't the oscillation start up, can you explain in details? Please! hyy95 wrote on Mar 17th, 2009, 7:25pm:
[/quote] can you share more details on this one? How do you derive the Rf value based on oscillation margin and drive current for crystal. Or can you point me to a paper that discuss this in details? Thanks! |
Title: Re: question about crystal oscillator Post by pancho_hideboo on Mar 17th, 2009, 10:12pm hyy95 wrote on Mar 17th, 2009, 9:25pm:
These are too basic issues. So read circuit theory text book for beginner. I'm not kind and patient enough for explaining such too basic issues. Maybe someone who is very kind and patient will help you. |
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