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E7D07

Why is very stable reference oscillator normally used as part of a phase-locked loop (PLL) frequency synthesizer?

SelectAnswer
AAny amplitude variations in the reference oscillator signal will prevent the loop from locking to the desired signal
BAny amplitude variations in the reference oscillator signal will prevent the loop from changing frequency
CAny phase variations in the reference oscillator signal will produce phase noise in the synthesizer output
DAny phase variations in the reference oscillator signal will produce harmonic distortion in the modulating signal