The Journal of Korean Institute of Electromagnetic Engineering and Science (한국전자파학회논문지)

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Improvement of Phase Noise for Oscillator Using Frequency Locked Loop

주파수 잠금회로를 이용한 발진기의 위상잡음 개선

  • Kim, Wook-Lae (Department of Radio Science and Engineering, Chungnam National University) ;
  • Lee, Chang-Dae (Department of Radio Science and Engineering, Chungnam National University) ;
  • Kim, Yong-Nam (Department of Radio Science and Engineering, Chungnam National University) ;
  • Im, Pyung-Soon (Department of Radio Science and Engineering, Chungnam National University) ;
  • Lee, Dong-Hyun (Department of Radio Science and Engineering, Chungnam National University) ;
  • Yeom, Kyung-Whan (Department of Radio Science and Engineering, Chungnam National University)
  • 김욱래 (충남대학교 전파공학과) ;
  • 이창대 (충남대학교 전파공학과) ;
  • 김용남 (충남대학교 전파공학과) ;
  • 임평순 (충남대학교 전파공학과) ;
  • 이동현 (충남대학교 전파공학과) ;
  • 염경환 (충남대학교 전파공학과)
  • Received : 2016.05.18
  • Accepted : 2016.07.11
  • Published : 2016.08.01
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Abstract

In this paper, we showed the phase noise of voltage controlled oscillator(VCO) can be radically improved using FLL(Frequency Locked Loop). At first, a 5 GHz VCO is fabricated using a hair-pin resonator. The fabricated VCO shows a phase noise of -53.1 dBc/Hz at 1 kHz frequency offset. In order to improve the phase noise of the fabricated VCO, a FLL is constructed using the feedback loop that consists of the VCO, a frequency detector composed of 5 GHz resonator, loop-filter, and level shifter. The fabricated FLL is designed to oscillate at a frequency of 5 GHz, and its measured phase noise is about -120.6 dBc/Hz at 1 kHz offset frequency. As a result, the phase noise of VCO can be radically improved by about 67.5 dB applying FLL. In addition, the measured phase noise performance is close to that of crystal oscillator.

본 논문에서는 주파수 잠금회로(FLL: Frequency Locked Loop)를 이용하여 발진기의 위상잡음을 개선할 수 있음을 보였다. 1차적으로 헤어-핀 공진기를 이용하여 전압제어발진기(VCO)를 제작하였다. 제작된 VCO는 발진주파수 5 GHz에서 위상잡음을 측정한 결과, 1 kHz offset 주파수에서 -53.1 dBc/Hz를 보였다. 위상잡음을 개선하기 위하여, VCO에 5 GHz 공진기로 구성된 주파수 검출기(frequency detector), 루프 필터, 전위변환기(level shifter)를 이용 궤환회로를 구성, 주파수 잠금회로를 구성하였다. 제작된 주파수 잠금회로는 5 GHz의 주파수에서 발진하고, 1 kHz offset 주파수에서 -120.6 dBc/Hz의 위상잡음을 보였다. 따라서 주파수 잠금회로를 이용, VCO의 위상잡음을 획기적으로 약 67.5 dB 개선할 수 있음을 보였다. 또한, 얻어진 주파수 잠금회로를 이용한 발진기의 위상잡음 성능은 수정발진기의 위상잡음과 비견할만한 것이다.

Keywords

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