Journal of Advanced Navigation Technology (한국항행학회논문지)

The Korean Navigation Institute (한국항행학회)
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High Efficiency Power Amplifier using Analog Predistorter

아날로그 전치왜곡기를 이용한 고효율 전력증폭기

  • Choi, Jang-Hun (Department of Electronic Engineering, Kumoh National Institute of Technology) ;
  • Kim, Young (Department of Electronic Engineering, Kumoh National Institute of Technology) ;
  • Yoon, Young-Chul (Department of Electronic Engineering, Kwandong University)
  • 최장헌 (금오공과대학교 전자공학과) ;
  • 김영 (금오공과대학교 전자공학과) ;
  • 윤영철 (관동대학교 전자정보통신공학부)
  • Received : 2014.05.13
  • Accepted : 2014.06.11
  • Published : 2014.06.30
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Abstract

This paper presents the Doherty power amplifier with a digitally controlled analog predistorter circuit of Scintera Corp. to produce high power efficiency and high linearity performance. The analog predistorter improves the linearity performance because of controlling amplitude and phase values of input signal in order to improve intermodulation performance of power amplifier. Also, the power amplifier is designed by the Doherty technology to obtain the high efficiency performance. To validate the Scintera's analog predistorter, we are implemented the power amplifier with Doherty method at center frequency 2150 MHz. Compared with the balanced amplifier, the power amplifier is improved above 11% enhanced efficiency and more than 15 dB ACPR improvement.

본 논문은 고효율 고선형 특성을 얻기 위하여 신테라사가 제공한 디지털로 제어되는 아날로그 전치왜곡 칩을 이용한 도허티 전력증폭기를 설계하였다. 여기서 사용된 아날로그 전치왜곡기는 입력과 출력신호를 비교하여 출력의 혼변조 신호 특성을 개선하기 위하여 입력 신호의 크기와 위상을 조절함으로서 선형성을 개선시켰다. 또한, 도허티 전력증폭기를 설계하여 이용함으로써 고효율의 특성을 얻었다. 제작된 전력증폭기는 중심주파수 2150 MHz에서 평형증폭기와 비교하여 11% 이상의 효율 개선 효과와 출력 전력 100W 이하에서 인접채널 전력을 15 dB 이상 개선시켰다.

Keywords

References

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