Discussion
Which of the following does not improve frequency stability?
Increasing the amplifier's gain margin
Raising the resonator's quality factor
Buffering the output from the load
Holding the resonator at a constant temperature
Answer: A
Extra gain margin helps the circuit start reliably but does nothing for the frequency, and if it leads to hard clipping it can make matters worse. The other three attack the three principal causes of instability: loop phase disturbances, load pulling and thermal drift. Sorting proposed remedies by which disturbance each addresses is what stops effort going into the one that happens to be easiest to change.
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