Discussion
Why does a crystal oscillator hold its frequency so much better than an LC type?
Answer: B
A crystal's quality factor runs from tens of thousands to over a million, against a few hundred for a good LC tank, so the phase characteristic is enormously steeper and any phase disturbance in the loop moves the frequency by a correspondingly tiny amount. Amplitude control, gain and feedback fraction affect the output rather than the frequency. Every question about frequency stability comes back to the steepness of the phase characteristic, and quartz provides the steepest available at reasonable cost.
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