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

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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A Design of IQ Modulator for Direct Carrier Modulation Systems

직접 반송파 변조 시스템을 위한 IQ 변조기 설계

  • Mun, Tae-Su (Department of Electronics & Communication Engineering, IT Convergence Research Center, Chonbuk National University) ;
  • Kim, Phirun (Department of Electronics & Communication Engineering, IT Convergence Research Center, Chonbuk National University) ;
  • Jeong, Yong-Chae (Department of Electronics & Communication Engineering, IT Convergence Research Center, Chonbuk National University)
  • 문태수 (전북대학교 전자정보공학부 및 IT융합연구센터) ;
  • ;
  • 정용채 (전북대학교 전자정보공학부 및 IT융합연구센터)
  • Published : 2011.09.30
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Abstract

In this paper, a novel IQ modulator that precisely controls the magnitude and phase of input signals is proposed. The proposed IQ modulator consists of low phase deviation attenuators, a splitter, and a combiner. In order to overcome the phase deviation characteristics found in conventional attenuators, a novel phase compensation technique has been adopted and mathematically analyzed. Linear vector arrays along the center point with large magnitude output signal variations in a full $360^{\circ}$ phase control are achieved on a polar plane by the proposed IQ modulator.

본 논문에서는 입력 신호의 진폭과 위상을 미세 조정할 수 있는 새로운 IQ 변조기를 제안하였다. 제안된 IQ 변조기는 저위상 편차 감쇠기, 분배기, 그리고 결합기로 구성되어 있다. 기존 감쇠기의 위상 편차 특성을 극복하기 위한 새로운 위상 보상 기술을 사용하였고, 이를 수식적으로 분석하였다. 제안하는 IQ 변조기를 통하여 완전한 $360^{\circ}$의 위상 조정과 동시에 입력 신호의 큰 진폭 조정이 가능하며, 극좌표계의 중심점을 지나는 선형적인 IQ신호 배열을 구현하였다.

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References

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