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

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Design of High-Power and High-Efficiency Broadband Amplifier Using 1:4 Transmission Line Transformer

1:4 전송 선로 트랜스포머를 이용한 고출력 고효율 광대역 전력 증폭기의 설계

  • Kim, Kyung-Won (School of Information and Communication Engineering, Sungkyunkwan University) ;
  • Seo, Min-Cheol (School of Information and Communication Engineering, Sungkyunkwan University) ;
  • Cho, Jae-Yong (School of Information and Communication Engineering, Sungkyunkwan University) ;
  • Yoo, Sung-Cheol (School of Information and Communication Engineering, Sungkyunkwan University) ;
  • Kim, Min-Su (School of Information and Communication Engineering, Sungkyunkwan University) ;
  • Kim, Hyung-Cheol (School of Information and Communication Engineering, Sungkyunkwan University) ;
  • Oh, Jun-Hee (School of Information and Communication Engineering, Sungkyunkwan University) ;
  • Sim, Jae-Woo (Peopleworks Co.) ;
  • Yang, Youn-Goo (School of Information and Communication Engineering, Sungkyunkwan University)
  • 김경원 (성균관대학교 정보통신공학부) ;
  • 서민철 (성균관대학교 정보통신공학부) ;
  • 조재용 (성균관대학교 정보통신공학부) ;
  • 유성철 (성균관대학교 정보통신공학부) ;
  • 김민수 (성균관대학교 정보통신공학부) ;
  • 김형철 (성균관대학교 정보통신공학부) ;
  • 오준희 (성균관대학교 정보통신공학부) ;
  • 심재우 (피플웍스(주)) ;
  • 양영구 (성균관대학교 정보통신공학부)
  • Published : 2010.02.28
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Abstract

This paper presents a design of a 100 W high-efficiency power amplifier, whose operational frequency band expands from 30 to 512 MHz, using negative feedback network, push-pull structure, broadband RF choke, and transmission line transformer for balun configuration. The push-pull amplifier has been tuned for higher output power using a shunt capacitor as a matching component at its load especially for high-frequency region. The implemented power amplifier exhibited a very flat power gain of $18.34{\pm}0.9\;dB$ throughout the operating frequency band and very high power-added efficiency(PAE) of greater than 40% at an output power of 100 W. It also showed second- and third-harmonic distortion levels of below -34 dBc and -12 dBc, respectively, through the entire operating frequency band.

본 논문에서는 부궤환 회로, 푸쉬풀 구조, 광대역 RF choke, 전송 선로 트랜스포머를 이용하여 30~512 MHz의 초광대역에서 동작하는 100 W 고효율 전력 증폭기를 설계하였다. 출력 전력을 향상시키고자 전송 선로를 이용한 트랜스포머에 병렬로 커패시터를 삽입하여 적절하게 로드 임피던스를 정합하였다. 제작한 광대역 전력 증폭기는 동작 주파수 대역에서 100 W 이상의 출력 전력과 $18.34{\pm}0.9\;dB$의 높고 고른 이득 특성을 보였다. one-tone 측정에서 2차 고조파는 -34 dBc 이하, 3차 고조파는 -12 dBc 이하의 선형성 특성을 보였으며, 출력 전력 100 W에서 약 40% 이상의 고효율 특성을 보였다.

Keywords

References

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