When a PLL is set up as an FM detector, the input FM signal is applied to the input of
A) the low-pass filter of the PLL
B) the frequency multiplier of the PLL
C) the phase detector of the PLL
D) the VCO of the PLL

Question

Quizplus · Accepted Answer

In a Phase-Locked Loop (PLL) used as an FM detector, the input FM signal is applied to the phase detector. The phase detector compares the phase of the input signal with the phase of the signal from the Voltage-Controlled Oscillator (VCO), generating an error signal that adjusts the VCO to match the input signal's frequency, effectively demodulating the FM signal.

When a PLL Is Set Up as an FM Detector