When a PLL is set up as an FM detector, the output intelligence signal appears at the output of
A) the VCO of the PLL
B) the low pass filter of the PLL
C) the frequency multiplier of the PLL
D) the phase detector of the PLL

Question

Quizplus · Accepted Answer

The output intelligence signal in a PLL (Phase Locked Loop) used as an FM detector appears at the output of the low pass filter. This is because the phase detector compares the input signal with the VCO output, creating a signal that contains the difference in phase (which corresponds to the frequency modulation), and the low pass filter then extracts this modulation information.

When a PLL Is Set Up as an FM Detector