Discussion
An oscillator starts but its output is heavily distorted. What is the likely cause?
Answer: D
Too much loop gain drives the amplitude up until the device clips against the supply rails, and the flattened waveform carries strong harmonics. A loop gain below unity would prevent starting altogether, and a high quality factor would clean the output rather than dirty it. The remedy is either less gain or a gentler amplitude control, and which is appropriate depends on whether a clean sine is actually needed.
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