Journal of the Institute of Electronics Engineers of Korea TC (대한전자공학회논문지TC)

The Institute of Electronics and Information Engineers (대한전자공학회)
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Research on PAE of Doherty Amplifier with Low-pass Filter of Wide Stopband

광대역 특성의 LPF를 이용한 도허티 증폭기의 전력 효율 향상에 관한 연구

  • Jung, Du-Won (Information and Telecommunication Engineering, Soongsil University) ;
  • Seo, Chul-Hun (Information and Telecommunication Engineering, Soongsil University)
  • 정두원 (숭실대학교 정보통신정자공학부) ;
  • 서철헌 (숭실대학교 정보통신정자공학부)
  • Published : 2009.01.25
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Abstract

In this paper, the power added efficiency(PAE) of a Doherty amplifier has been improved by applying Photonic Bandgap(PBG) characteristics on the output of amplifier. As a result of the high order harmonics termination, excellent improvement in PAE, maximum output power as well as linearity is obtained. The PAE is improved as much as relatively 35% compared with a conventional Doherty amplifier. Moreover, size of LPF is reduced by PBG characteristics. Therefore the whole amplifier circuit size is considerably reduced by diminishing in size of the LPF as compared with a Doherty amplifier using conventional LPFs.

본 논문에서는 PBG 특성을 갖는 새로운 Low-pass Filter(LPF)를 증폭기의 출력정합단에 적용하여 도허티 증폭기의 효율을 향상하였다. 제안된 LPF 적용된 도허티 증폭기는 고조파 성분들이 저지됨으로 선형성은 그대로 유지하면서 출력 전력의 증가와 소비 전류의 감소로 일반적인 도허티 증폭기와 비교하여 35%의 효율을 증가시켰다. 또한 PBG 특성을 사용함으로써 LPF의 크기를 줄였다. 이를 통해 일반적인 마이크로 스트립 라인의 LPF를 사용한 도허티 증폭기보다 전체적인 도허티 증폭기의 크기를 줄일 수 있었다.

Keywords

References

  1. S. C. Cripps, RF Power Amplifier for Wireless Communications. Boston: Artech House, pp. 290–303, 2006
  2. M. Iwamoto, A.Williams, P.-F. Chen, A. G. Metzger, L. E. Larson, and P. M. Asbeck, "An extended Doherty amplifier with high efficiency over a wide power range," IEEE Trans. Microw. Theory Tech., vol. 49, no. 12, pp. 2472–2479, Dec. 2001 https://doi.org/10.1109/22.971638
  3. Y. Jeong, S. Jeong, J. Lim, and S. Nam, "A new method to suppress harmonics using λ/4 bias line combined by defected ground structure in power amplifiers," IEEE Microw. Wireless Compon. Lett., vol. 13, no. 12, pp. 538–540, Dec. 2003 https://doi.org/10.1109/LMWC.2003.814111
  4. J. D. Joannopoulos, R. D. Meade and J. N. Winn, "Photonic Crystals : Molding the Folow of Light," Photonic Crystals : Molding the Folow of Light, 1995
  5. T. Kim, and C. Seo, "A Novel Photonic Bandgap Structure for LowpassFilter of Wide Stopband," IEEE Microw. Guided Wave Lett., vol. 10, No. 1, pp. 13-15, Jan. 2000 https://doi.org/10.1109/75.842072
  6. B. Kim and Y. Kim. Nam, "Mixed Coupling Structure for the Cross Coupling of Comb-line Filters," Microw. and Opt. Tech. Lett., vol. 35, no. 1, pp. 20–23, Oct. 2002 https://doi.org/10.1002/mop.10505
  7. B. Kim and Y. Kim. Nam, "The Doherty Power Amplifier," IEEE Microw. Magazine, pp. 42–50, Oct. 2006
  8. H. Choi, J. Lim and Y. Jeong, "A New Design of Doherty Amplifiers Using Defected Ground Structure," IEEE Microw. Wireless Compon. Lett., vol. 16, no. 12, pp. 687–689, Dec. 2006 https://doi.org/10.1109/LMWC.2006.885636