Question

PLL in FM detection stands for ______

(a) Phase locked loop

(b) Programmable logic loop

(c) Phase locked logic

(d) Programmable locked loop

This question was addressed to me in final exam.

This interesting question is from Angle modulation in chapter Modulation Techniques for Mobile Radio of Wireless/Mobile

Answer 1

The correct option is (a) Phase locked loop

To explain I would say: PLL stands for phase locked loop. The PLL is a closed loop control system which can track the variations in the received signal phase and frequency.