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Rf is inversly proportional to crystal operating frequency

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kavithak23

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crysal IO design

Hi,
If Rf provides only DC biasing, why is the value varied wrt to Crystal frequency. Iam seeing Rf is inversly proportional to crystal operating frequency. And why are they of huge value. I can provide feedback using a small values resistro since the current at the input of inverter is zero.
 

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