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crystal oscilaltor frequency stabilaty

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zhonghan

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I want to perform loop gain and phase shift simulation for a common crystal oscillator showed in pasted figure. Simulation results is very different from that of some papers, and oscillation seems not to occcur for phase shift less than 180 . is my method wrong ? pls give some help!
 

Can you post your simulation files and waveforms of your simulation results?
 

This is a positive feedback loop, you should maintain gain >1.
 

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