Firmware implementation and experimental research of the phase-locked loop with improved noise immunity

Authors

DOI:

https://doi.org/10.15587/1729-4061.2018.143178

Keywords:

, phase-locked loop (PLL), modified phase detector (PD), narrowband filter (NBF)

Abstract

This paper presents a method for improvement of the phase-locked loop (PLL) noise immunity by using a modified phase detector. The article shows structural diagram of the PLL with the modified phase detector and describes the criterion for choosing the parameters of the narrowband filter and the high-pass filter to prevent distortions of information signal. Simulation of both classical and modified devices was carried out to find a noise threshold, which causes phase-locked loop to unlock. Simulation results show that multiple cycle slips of synchronization in short period of time in modified PLL occur for higher levels of noise (by 1.5–4 dB depending on PLL parameters), than in classical PLL. Both devices were software implemented on FPGA (field programmable gate array) logic and experimental studies of their noise immunity were conducted. The results of experimental studies qualitatively correspond to simulation ones and show that the that noise threshold of the modified phase detector is greater up to 1–2.5 dB depending on the device parameters. Experimental research also shows that modified phase detector does not deteriorate the dynamic properties of whole device and even improves them in comparison to classical PLL.

Author Biographies

Andrii Bondariev, Lviv Polytechnic National University S. Bandery str., 12, Lviv, Ukraine, 79013

Doctor of Technical Sciences, Professor

Department of theoretical radio engineering and radio measurement

Serhii Altunin, Lviv Polytechnic National University S. Bandery str., 12, Lviv, Ukraine, 79013

Postgraduate student

Department of theoretical radio engineering and radio measurement

Ivan Horbatyi, Lviv Polytechnic National University S. Bandery str., 12, Lviv, Ukraine, 79013

Doctor of Technical Sciences, Associate Professor

Department of theoretical radio engineering and radio measurement

Ivan Maksymiv, Lviv Polytechnic National University S. Bandery str., 12, Lviv, Ukraine, 79013

PhD, Assistant

Department of theoretical radio engineering and radio measurement

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Published

2018-09-28

How to Cite

Bondariev, A., Altunin, S., Horbatyi, I., & Maksymiv, I. (2018). Firmware implementation and experimental research of the phase-locked loop with improved noise immunity. Eastern-European Journal of Enterprise Technologies, 5(9 (95), 17–25. https://doi.org/10.15587/1729-4061.2018.143178

Issue

Vol. 5 No. 9 (95) (2018): Information and controlling system

Section

Information and controlling system

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Copyright (c) 2018 Andrii Bondariev, Serhii Altunin, Ivan Horbatyi, Ivan Maksymiv

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