Discussion
What limits an oscillator's amplitude once it has started?
Answer: D
Growth continues until a non-linearity - clipping at the supply rails, a lamp's rising resistance, a diode network, or an automatic gain control loop - pulls the average loop gain back to exactly one. The phase condition is unaffected by amplitude, and neither supply current nor tank losses provide the regulation. Which non-linearity is used decides how clean the output is: hard clipping gives a distorted waveform, while a gentle amplitude control preserves the sine.
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