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Individual Order Intermodulation Distortion Generator Using Series Feedback of Diode and Its Application

다이오드 직렬 궤환을 이용한 개별 차수 혼변조 발생기 및 응용

  • Son, Kang-Ho (School of Electronics Engineering, Kumoh National Institute of Technology) ;
  • Kim, Seung-Hwan (School of Electronics Engineering, Kumoh National Institute of Technology) ;
  • Kim, Ell-Kou (School of Electronics Engineering, Kumoh National Institute of Technology) ;
  • Kim, Young (School of Electronics Engineering, Kumoh National Institute of Technology) ;
  • Yoon, Young-Chul (Electronics and Information Communication Engineering, Kwandong University)
  • 손강호 (금오공과대학교 전자공학부) ;
  • 김승환 (금오공과대학교 전자공학부) ;
  • 김일규 (금오공과대학교 전자공학부) ;
  • 김영 (금오공과대학교 전자공학부) ;
  • 윤영철 (관동대학교 전자정보통신부)
  • Published : 2008.10.31

Abstract

This paper proposes an individual order predistortion linearizer using intermodulation distortion(IMD) generator for cancellation the third and the fifth IMD of power amplifier. The IMD generator for controlling the third and the fifth IMD consist of common Emitter amplifier and Schottky diode. These signals are generated by series feedback of Schottky diode to obtain the inverse AM/AM and AM/PM characteristics of power amplifier. The individual order predistorters are consisted of individual IMD generator, power splitter and combiner. The test results show that the third and the fifth IMD can be improved by a maximum 13.5 dB and 0.9 dB in case of CW 2-tone signals. Also, the Adjacent Channel Leakage Ratio(ACLR) can be improved 2.3 dB, 2.5 dB at ${\pm}0.885$ MHz, ${\pm}1.23$ MHz offset frequency for CD-MA IS-95 2FA signals.

본 논문에서는 개별 차수 혼변조 신호 발생기를 이용한 전치 왜곡 선형화기 구조를 제안하였다 혼변조 신호 발생기는 공통 에미터 증폭기의 에미터 단자에 쇼트키 다이오드를 삽입하여, 3차와 5차 혼변조 신호를 다이오드 바이어스 전압에 따라서 발생시킨다. 이렇게 만들어진 혼변조 신호는 다이오드의 직렬 궤환을 이용한 것으로, 다이오드 바이어스 제어에 따라서 혼변조 신호의 크기와 위상을 변화시킬 수 있다. 이러한 혼변조 발생기를 전치 왜곡 선형화기로 사용했을 때, 반송파 2톤 신호 인가 시 3차와 5차 혼변조 신호는 각각 13.5 dB, 0.9 dB의 개선을 보였고, 광 대역폭을 갖는 CDMA IS-95 2FA 신호를 인가하였을 경우, 중심 주파수로부터 ${\pm}0.885$ MHz, ${\pm}1.23$ MHz 떨어진 지점에서 ACLR이 각각 2.3 dB, 2.5 dB의 개선됨을 확인하였다.

Keywords

References

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