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 Feedforward Linear Power Amplifier using Error Feedback Technique

에러 피드백 기술을 이용한 피드 포워드 선형 전력 증폭기

  • 김완종 (광운대학교 전파공학과(Dept. of Radio Science and Engineering, Kwangwoon University)) ;
  • 조경준 (광운대학교 전파공학과(Dept. of Radio Science and Engineering, Kwangwoon University)) ;
  • 김종헌 (광운대학교 전파공학과(Dept. of Radio Science and Engineering, Kwangwoon University)) ;
  • 김남영 (FRIC 교육 및 연구센터/미션 테크놀로지 연구센터(RFIC Research and Education Center/Mission Technology Center)) ;
  • 이종철 (FRIC 교육 및 연구센터/미션 테크놀로지 연구센터(RFIC Research and Education Center/Mission Technology Center)) ;
  • 이병제 (FRIC 교육 및 연구센터/미션 테크놀로지 연구센터(RFIC Research and Education Center/Mission Technology Center))
  • Published : 2000.12.01
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Abstract

This paper presents a feedforward linear power amplifier (LPA) using error feedback technique to achieve low intermodulation distortions(IMD) of power amplifiers for base stations. Especially, the proposed linear power amplifier is applied to feedforward technique combined with error feedback technique, which has no loss of amplifier gain unlike typical feedback technique. The proposed LPA is designed by using HP ADS ver. 1.3, fabricated. When two-tone signals at 1850 MHz and 1851.25 MHz with -7 dBm/tone from synthesizers are injected into the main power amplifier with gain of 28 dB and P1dB of 1W, the proposed LPA could reduce more than 35 dB.

본 논문에서는 기지국용 전력 증폭기의 혼 변조 성분들을 극도로 억압하기 위해서 Error feedback 방식을 사용한 Feedforward 선형 전력 증폭기를 설계하였다. 특히, 제안된 선형 전력 증폭기는 기존의 피드백 기술의 단점인 증폭 이득의 손실을 없앤 Error feedback 기술과 Feedforward 기술을 혼합하여 적용하였다. 제안된 선형 전력 증폭기는 HP사의 EEsof ADS ver.1.3을 사용해서 설계.제작하였다. 측정결과, 이득 28 ㏈, P1㏈ 31 ㏈m인 주 전력 증폭기에 -7 ㏈m/tone을 갖는 1850 MHz와 1851.25 MHz의 2-tone 신호를 인가한 결과 전체 IMD가 약 35 ㏈ 개선되었다.

Keywords

References

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