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Which risk increases when a phase-locked loop's (PLL) loop filter bandwidth in a radio receiver is excessively widened?

A)Spurious signal locking emerges
B)Oscillator phase noise decreases
C)Settling time minimizes optimally
D)Reference frequency feed-through attenuates

💡 Explanation

Wider PLL loop filter bandwidth allows more noise to influence VCO control, because of increased susceptibility to spurious signals. Therefore, the PLL erroneously locks onto a spurious signal rather than the desired signal; rather than maintaining cleaner oscillation.

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