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

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
권호 표지

Design of a High Power and High Gain Two-Stage Doherty Power Amplifier

고 출력 고 이득 2단 도허티 전력증폭기의 설계

  • Ghim, Jae-Gon (Dept. of Radio Science & Engineering, Kwangwoon University) ;
  • Kim, Ji-Yeon (Dept. of Radio Science & Engineering, Kwangwoon University) ;
  • Lee, Dong-Heon (Dept. of Radio Science & Engineering, Kwangwoon University) ;
  • Kim, Jong-Heon (Dept. of Radio Science & Engineering, Kwangwoon University)
  • Published : 2006.11.30
Download PDF
⟨ Previous Next ⟩

Abstract

A high power and high gain Doherty amplifier is designed by using embedded driver amplifiers in the final stage. The operational characteristics of a two-stage Doherty amplifier are analyzed, as a function of the two-stage peaking amplifier gate biases. The driver stages and final output stages are implemented using two single-ended MRF21045s and a single push-pull packaged MRF5P21180, respectively. This two-stage Doherty amplifier demonstrated 27 dB gain with a PAE of 23 % at 15 W average output power.

본 논문에서는 최종단에 내장된 구동 증폭기를 사용하여 높은 이득을 갖는 고 출력 고 이득 도허티 전력 증폭기를 설계하였다. 2단 도허티 증폭기의 동작 특성을 2단 피킹 증폭기의 게이트 바이어스에 관한 함수로서 해석하였다. 구동단과 최종단은 각각 single-ended MRF21045 2개와 single push-pull packaged MRF21180 1개를 사용하여 제작하였다. 본 논문에서 구현된 2단 도허티 증폭기는 평균 출력 전력 15 W에서 27 dB의 이득과 23 %의 전력 부가 효율을 가진다.

Keywords

References

  1. W. H. Doherty, 'A new high power amplifier for modulated waves', Proc. IRE, vol. 24, no. 9, pp. 1163-1182, Sep. 1936 https://doi.org/10.1109/JRPROC.1936.228468
  2. B. Shin, J. Cha, J Kim, Y. Y. Woo, J. Yi, and B. Kim, 'Linear power amplifier based on 3-Way Doherty amplifier with perdistorter', IEEE MTT-s Int. Microwave Symp. Dig., pp. 687-690, 2004
  3. K. J. Cho, W. J. Kim, J. H. Kim, and S. P. Stapleton, 'Linearity optimization of a high power Doherty amplifier based on post-distortion compensation', Microwave and Wireless Components Letters, IEEE., vol. 15, issue 11, pp. 748-750, Nov. 2005 https://doi.org/10.1109/LMWC.2005.858985
  4. W. J. Kim, S. P. Stapleton, K. J. Cho, and J. H. Kim, 'Digital predistortion of a Doherty amplifier with a weak memory with in a connected solution', IEEE Vehicular Technology Conf., Sep. 2004
  5. K. J. Cho, J. H. Kim, and S. P. Stapleton, 'A highly efficient Doherty feedforward linear power amplifier for W-CDMA base-station application', IEEE Trans. Microw. Theory Tech., vol. 53, issue 1, pp. 292-300, Jan. 2005 https://doi.org/10.1109/TMTT.2004.839341
  6. E. J. Crescenzi, R. S. Pengelly, S. M. Wood, and R. E. Buss, '60 watt doherty amplifiers using high gain 2-stage hybrid amplifier modules', IEEE MTT-S Int. Microwave Symp. Dig., pp. 1383-1386, 2005
  7. S. C. Cripps, RF Power Amplifiers for Wireless Communications, Norwood, MA: Artech Housse, 1999