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http://dx.doi.org/10.5515/KJKIEES.2018.29.10.773

Analysis of the Phase Noise Improvement of a VCO Using Frequency-Locked Loop  

Yeom, Kyung-Whan (Department of Radio Science & Engineering, Chungnam National University)
Lee, Dong-Hyun (Department of Radio Science & Engineering, Chungnam National University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.29, no.10, 2018 , pp. 773-782 More about this Journal
Abstract
A frequency-locked loop(FLL) is a negative-feedback system that uses a frequency detector to improve the phase noise of a voltage-controlled oscillator(VCO). In this work, a theoretical analysis of the phase noise of a VCO in an FLL is presented. The analysis shows that the phase noise of the VCO follows the phase noise determined by the frequency detector and the loop filter within the FLL loop bandwidth, while the phase noise of the VCO appears outside the loop bandwidth. Therefore, it is possible to design an FLL that minimizes the phase noise of the VCO based on the theoretical analysis results. The theoretical phase noise results were verified through experiments.
Keywords
Frequency Locked Loop; Phase-Locked Loop; Frequency Detector; Resonator; Phase Detector;
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Times Cited By KSCI : 2  (Citation Analysis)
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