Discussion
Which oscillator would you choose for a tunable radio-frequency source?
Answer: A
A varactor-tuned Colpitts disciplined by a phase-locked loop gives both the range and, through the loop's crystal reference, the accuracy. A Pierce alone cannot be tuned usefully far, and the RC and multivibrator types are audio-frequency circuits with poor stability. Where two specifications conflict, the usual answer is two components each supplying what the other lacks, disciplined by a loop that combines them.
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