AT02 FM Frequency Demodulators-1 Curriculum Manual Chapter 8 Chapter 8 FM Frequency Demodulators-1 Objectives of this Chapter Having studied this chapter you will be able to: outline the principles of FMdemodulation. Compare the performance of Detuned Resonant, Quadrature and Phase-Locked Loop demodulators. Describe the operation of Detuned Resonant, Quadrature and Phase-Locked Loop demodulators. Introduction In this chapter, we investigate the main characteristics of an FM Receiver and the operation of Detuned Resonant, Quadrature and Phase-Locked Loop FM demodulators