PLL System with Active PI Filter for FM Demodulation Application

• Published in: 2022 IEEE 13th Control and System Graduate Research Colloquium (ICSGRC) pp. 151 - 154
• Main Authors: Bakar, Siti Juliana Abu, Setumin, Samsul, Ani, Adi Izhar Che
• Format: Conference Proceeding
• Language: English
• Published: IEEE 23-07-2022
• Subjects: Active filters; active-PI filter; Behavioral sciences; Circuit stability; Control systems; FM demodulation; Frequency modulation; Phase locked loops; phase-locked loop; Stability criteria
• DOI: 10.1109/ICSGRC55096.2022.9845163

This work develops a phase-locked loop (PLL) system for FM demodulation application. As the dynamic behavior of the PLL system is depends on the loop filter, hence in this paper, the focus is on validating the performance of the FM demodulation using the PLL circuit with an active proportional-integral (PI) filter. The active filter is designed using two methods based on the standard H∞ approach, and the H∞ approach integrated with nonlinear stability criterion. From the experimental results, the performance of the FM demodulation PLL system with the active-PI filter designed using the H∞ approach integrated with nonlinear stability criterion produces smoother output than the one with the filter designed using the H∞ approach.