Performance
The quality metrics for a VFO include frequency stability, phase noise and spectral purity. All of these factors tend to be inversely proportional to the tuning circuit's Q factor. Since in general, the tuning range is also inversely proportional to Q, these performance factors generally degrade as the VFO's frequency range is increased.
Read more about this topic: Variable-frequency Oscillator
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—Roland Barthes (1915–1980)
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—William Shakespeare (1564–1616)