Changsik Park, Euntaek Han, Ikjae Kim, Dong-Kyoo Shin, Journal of Internet Computing and Services, Vol. 24, No. 3, pp. 9-26, Jun. 2023
10.7472/jksii.2023.24.3.9, Full Text:
Keywords: Frequency Synthesizer, Direct Frequency Synthesizer, Indirect Frequency Synthesizer, Railway Track Circuit

Abstract

The frequency synthesizer performs a simple function of generating the necessary frequency by manipulating the input frequency signal, but stable and precise frequency generation is essential for reliable operation in mechanical equipment such as communication, control, surveillance, medical and military fields. In various fields, analog and digital methods or hybrid methods have been used for frequency synthesis. Especially in the field of communication, a precise frequency synthesizer required for each frequency band from low frequency AF (Audio Frequency) to high frequency microwave is used. In this paper, a highly reliable frequency synthesizer is designed and implemented using FPGA(Field Programmable Gate Array) without using a microprocessor for application to a railway track circuit system using AF frequency. As a result of the experiment, it showed the performance of generating the target frequency with an accuracy of more than 99.999%. The AF-class frequency synthesizer with such high reliability is expected to play an important role in enhancing convenience, such as reducing the waiting time of citizens who use braking and signaling systems and reducing errors in planned operation when used in transportation such as railways and subways.

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