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 Research on the Bandwidth Extension of an Analog Feedback Amplifier by Using a Negative Group Delay Circuit

마이너스 군지연 회로를 이용한 아날로그 피드백 증폭기의 대역폭 확장에 관한 연구

  • Choi, Heung-Gae (IDEC Working Group, Division of Electronics and Information Engineering, Chonbuk National University) ;
  • Kim, Young-Gyu (IDEC Working Group, Division of Electronics and Information Engineering, Chonbuk National University) ;
  • Shim, Sung-Un (IDEC Working Group, Division of Electronics and Information Engineering, Chonbuk National University) ;
  • Jeong, Yong-Chae (IDEC Working Group, Division of Electronics and Information Engineering, Chonbuk National University) ;
  • Kim, Chul-Dong (Sewon Teletech. Inc.)
  • 최흥재 (전북대학교 전자정보공학부 및 반도체설계교육센터) ;
  • 김영규 (전북대학교 전자정보공학부 및 반도체설계교육센터) ;
  • 심성운 (전북대학교 전자정보공학부 및 반도체설계교육센터) ;
  • 정용채 (전북대학교 전자정보공학부 및 반도체설계교육센터) ;
  • 김철동 (세원텔레텍(주))
  • Published : 2010.10.31
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Abstract

In this paper, we propose an alternative method to increase the distortion cancellation bandwidth of an analog RF feedback power amplifier by using a negative group delay circuit(NGDC). A limited distortion cancellation bandwidth due to the group delay(GD) mismatch discouraged the use of feedback technique in spite of its powerful linearization performance. With the fabricated NGDC with positive phase slope over frequency, the feedback amplifier of the proposed topology experimentally achieved adjacent channel leakage ratio(ACLR) improvement of 15 dB over 50 MHz bandwidth at wideband code division multiple access(WCDMA) downlink band when tested with 2-carrier WCDMA signal. At an average output power of 28 dBm, ACLR of 25.1 dB is improved to obtain -53.2 dBc at 5 MHz offset.

본 논문에서는 마이너스 군지연 회로를 이용하여 아날로그 RF 피드백 증폭기의 선형성 개선 대역폭을 증가시킬 수 있는 새로운 방법을 제안한다. 피드백 증폭기는 피드백 경로의 전달 시간 오차로 인하여 선형성 개선 대역폭이 제한되며, 그로 인하여 강력한 선형성 개선 효과에도 불구하고 거의 사용되지 않고 있다. 선행 연구를 통해 설계된 마이너스 군지연 회로의 군지연 특성을 응용하여 기존의 피드백 구조의 한계인 군지연 정합 문제를 해결하였다. 제작된 피드백 증폭기에 2-carrier Wideband Code Division Multiple Access (WCDMA) 신호를 인가하여 측정한 결과, WCDMA 기지국 하향 대역의 50 MHz 대역 전반에 걸쳐서 15 dB 이상의 선형성 개선 효과를 얻을 수 있었다. 평균 출력 전력이 28 dBm일 때 5 MHz 이격된 주파수에서 측정된 인접 채널 누설비(Adjacent Channel Leakage Ratio: ACLR)는 최대 25.1 dB 개선되어 -53.2 dBc로 측정되었다.

Keywords

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