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

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Research on PAE and Linearity of Doherty Amplifier Using Adaptive Bias and PBG Structure

적응형 바이어스와 PBG를 이용한 Doherty 전력 증폭기 전력효율과 선형성 개선에 관한 연구

  • Lee Wang-Yeol (School of Electronic Engineering, Soong-sil University) ;
  • Seo Chul-Hun (School of Electronic Engineering, Soong-sil University)
  • 이왕열 (숭실대학교 정보통신공학부) ;
  • 서철헌 (숭실대학교 정보통신공학부)
  • Published : 2005.08.01
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Abstract

In this paper, adaptive bias circuit and PBG structure have been employed to suppress IMD(Inter-Modulation Distortion) and improve PAE(Power Added Efficiency) of the Doherty amplifier. Gate bias voltage has been controlled with the envelope of the input RF signal and PBG structure has been employed on the output port of Doherty amplifier. The proposed power amplifier using adaptive bias circuit and PBG has been improved the $IMD_3$ by 7.5 dBc, and the average PAR by $12\%$, respectively.

본 논문에서는 적응형 바이어스와 PBG 구조를 이용하여 Doherty 증폭기의 효율 및 선형성을 개선하였다. PBG 구조를 출력 정합회로에 구현하였으며, 적응형 바이어스를 peaking amplifier에 적용하여 Doherty 증폭기의 효율뿐 아니라 선형성을 개선할 수 있었다. 제안된 구조를 이용한 Doherty 증폭기는 기존의 전력증폭기에 비해 PAE $12\%$, $IMD_3-7.5dBc$ 개선하였다.

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References

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