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

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Implementation of Wideband Low Noise Down-Converter for Ku-Band Digital Satellite Broadcasting

Ku-대역 광대역 디지탈 위성방송용 저 잡음하향변환기 개발

  • Hong, Do-Hyeong (Department of Information & Communication Engineering, Kyungnam University) ;
  • Lee, Kyung Bo (MMCL Ltd. Research Center) ;
  • Rhee, Young-Chul (Department of Information & Communication Engineering, Kyungnam University)
  • 홍도형 (경남대학교 정보통신공학과) ;
  • 이경보 ((주)엠엠씨엘 연구소) ;
  • 이영철 (경남대학교 정보통신공학과)
  • Received : 2015.10.16
  • Accepted : 2016.02.11
  • Published : 2016.02.29
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Abstract

In this paper, wideband Ku-band downconverter was designed to receiver digital satellite broadcasting. The low-nose downconverter was designed to form four local oscillator frequencies(9.75, 10, 10.75 and 11.3 GHz) representing a low phase noise due to VCO-PLL with respect to input signals of 10.7 to 12.75 GHz and 3-stage low noise amplifier circuit by broadband noise matching, and to select intermediate frequency bands by digital control. The developed low-noise downconverter exhibited the full conversion gain of 64 dB, and the noise figure of low-noise amplifier was 0.7 dB, the P1dB of output signal 15 dBm, and the phase noise -85 dBc@10kHz at the band 1 carrier frequency of 9.75 GHz. The low noise block downconverter(LNB) for wideband digital satellite broadcasting designed in this paper can be used for global satellite broadcasting LNB.

본 논문에서는 디지털 위성방송을 수신하기 위하여 Ku-대역 광대역 하향변환기를 설계하였다. 설계된 저 잡음 하향변환기는 잡음 정합에 의한 3단 저 잡음 증폭회로와 10.7~12.75 GHz의 입력신호를 VCO-PLL에 의한 저 위상잡음을 나타내는 4개의 국부발진주파수(9.75, 10, 10.75 및 11.3 GHz)를 형성하고, 디지털 제어에 의하여 4-대역의 IF 주파수 채널을 선택할 수 있도록 설계하였다. 개발한 저 잡음 하향 변환기의 전체 변환이득 64 dB, 저 잡음 증폭기의 잡음지수는 0.7 dB, 출력신호의 P1dB는 15 dBm, band 1 반송주파수 9.75 GHz에서 위상잡음은 -85 dBc@10 kHz를 나타내었다. 설계한 광대역 디지털 위성방송용 하향변환기(LNB)는 국제적으로 이동하는 선박 등의 위성방송용으로 사용가능하다.

Keywords

References

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