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

  • 제26권3호
  • /
  • Pages.292-299
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  • 2015
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  • 1226-3133(pISSN)
  • /
  • 2288-226X(eISSN)
한국전자파학회 (The Korean Institute of Electromagnetic Engineering and Science)
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전력증폭기의 효율 및 선형성 개선을 위한 포락선 제거 및 복원 송신기

Envelope Elimination and Restoration Transmitter for Efficiency and Linearity Improvement of Power Amplifier

  • 조영균 (한국전자통신연구원 통신인터넷연구부문) ;
  • 김창완 (동아대학교 전자공학과) ;
  • 박봉혁 (한국전자통신연구원 통신인터넷연구부문)
  • 투고 : 2014.12.24
  • 심사 : 2015.03.10
  • 발행 : 2015.03.31
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초록

본 논문에서는 3-레벨 인코딩 기법을 적용하여 시스템의 효율과 선형성을 개선할 수 있는 새로운 구조의 EER 송신기를 제안하였다. 제안된 송신기는 첨두 전력 대 평균 전력비에 상관없이 동일한 크기의 신호만을 증폭하고, 채널대역 내의 양자화 노이즈를 감소시켜 높은 효율을 얻을 수 있으며, 포락선 신호와 위상 신호 간 시간 부정합 특성을 개선하여 높은 선형성을 가질 수 있도록 하였다. 130 nm CMOS 공정으로 제작된 송신기 칩은 8.5 dB의 첨두 전력 대 평균전력비를 갖는 LTE 20 MHz 신호에 대해 2.13 GHz의 반송주파수에서 3.7 %의 오류 벡터 크기와 37.5 dBc의 인접 채널 누설비 특성을 보인다.

An envelope elimination and restoration transmitter that uses a tri-level envelope encoding scheme is presented for improving the efficiency and linearity of the system. The proposed structure amplifies the same magnitude signal regardless of the input peak-to-average power ratio and reduces the quantization noise by spreading out the noise to the out-of-band frequency, resulting in the enhancement of power efficiency. An improved linearity is also obtained by providing a new timing mismatch calibration technique between the envelope and phase signal. Implementation in a 130 nm CMOS process, transmitter measurements on a 20-MHz long-term evolution input signal show an error vector magnitude of 3.7 % and an adjacent channel leakage ratio of 37.5 dBc at 2.13 GHz carrier frequency.

키워드

참고문헌

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