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E7D07

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

Select	Answer
A	Any phase variations in the reference oscillator signal will produce phase noise in the synthesizer output
B	Any phase variations in the reference oscillator signal will produce harmonic distortion in the modulating signal
C	Any amplitude variations in the reference oscillator signal will prevent the loop from locking to the desired signal
D	Any amplitude variations in the reference oscillator signal will prevent the loop from changing frequency

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