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

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

DOI QR Code

A Highly Efficient Multi-Mode Balanced Power Amplifier for W-CDMA Handset Applications

W-CDMA 단말기용 고효율 다중 모드 Balanced 전력증폭기

  • Kim, Un-Ha (School of Electrical Engineering and Computer Science and INMC, Seoul National University) ;
  • Park, Sung-Hwan (School of Electrical Engineering and Computer Science and INMC, Seoul National University) ;
  • Park, Hong-Jong (School of Electrical Engineering and Computer Science and INMC, Seoul National University) ;
  • Kwon, Young-Woo (School of Electrical Engineering and Computer Science and INMC, Seoul National University) ;
  • Kim, Jung-Hyun (Department of Electronics and System Engineering, Hanyang University)
  • 김운하 (서울대학교 전기컴퓨터공학부) ;
  • 박성환 (서울대학교 전기컴퓨터공학부) ;
  • 박홍종 (서울대학교 전기컴퓨터공학부) ;
  • 권영우 (서울대학교 전기컴퓨터공학부) ;
  • 김정현 (한양대학교 전자시스템공학과)
  • Received : 2012.02.06
  • Accepted : 2012.03.27
  • Published : 2012.05.31
Download PDF
⟨ Previous Next ⟩

Abstract

A highly efficient multi-mode balanced power amplifier(PA) structure is proposed for W-CDMA handset applications. The proposed PA has 2-stage amplifier configuration and the stage-bypass and load impedance switching techniques were applied to enhance power efficiency at medium power level as well as low output power level. Using the two techniques, four highly efficient power modes were realized. To demonstrate the usefulness of the proposed structure, a GaAs HBT balanced PA module was designed, fabricated, and measured.

W-CDMA 단말기에 적용 가능한 고효율 다중 모드 balanced 전력증폭기 구조를 제안하였다. 제안된 전력증폭기는 2단 증폭기로 구성되었고, 낮은 전력 영역 및 중간 전력 영역에서 효율을 증가시키기 위해 stage-bypass 기법과 부하 임피던스 스위칭 기법이 적용되었다. 이를 통해 4가지의 고효율 전력 모드를 구현하였으며, 제안된 구조를 실험적으로 검증하기 위해 GaAs HBT 전력증폭기를 설계 및 제작하였고, 측정하였다.

Keywords

References

  1. G. Zhang, S. Chang, and Z. Alon, "A high performance balanced power amplifier and its integration into a front-end module at PCS band", IEEE RFIC Symp. Digest, pp. 251-254, Jun. 2007.
  2. G. Zhang, S. Chang, S. Chen, and J. Sun, "Dual mode efficiency enhanced linear power amplifiers using a new balanced structure", IEEE RFIC Symp. Digest, pp. 245-248, Jun. 2009.
  3. U. Kim, J. Kim, and Y. Kwon, "A highly efficient GaAs HBT MMIC balanced power amplifier for W-CDMA handset applications", ETRI Journal, vol. 30, no. 5, pp. 598-600, Oct. 2009.
  4. B. Sogl, W. Thomann, J. Mueller, W. Bakalski, and A. Scholtz, "A multi-mode power amplifier for enhanced PAE in back-off operation with load insensitive architecture", IEEE Radio and Wireless Symp. Digest, pp. 542-545, Jan. 2009.
  5. 김운하, 강성윤, 천동영, 권영우, 김정현, "WCDMA 단말기용 Balanced 전력증폭기의 Load Insensitivity 분석", 한국전자파학회논문지, 23(1), pp. 68-75, 2012년 1월.
  6. T. Fowler, K. Burger, N. Cheng, A. Samelis, E. Enobakhare, and S. Rohlfing, "Efficiency improvement techniques at low power levels for linear CDMA and WCDMA power amplifiers", IEEE RFIC Symp. Digest, pp. 41-44, Jun. 2002.
  7. G. Hau, M. Singh, "Multi-mode WCDMA power amplifier module with improved low-power efficiency using stage-bypass", IEEE RFIC Symp. Digest, pp. 163-166, May 2010.
  8. J. Kim, D. Lee, S. Jung, and Y. Kwon, High Efficiency Power Amplifier with Multiple Power Modes, US Patent no. 6,900,692, May, 2005.
  9. S. Kim, J. Lee, J. Shin, and B. Kim, "CDMA handset power amplifier with a switched output matching circuit for low/high power mode operations", IEEE MTT-S Int. Digest, pp. 1523-1526, Jun. 2004.
  10. W. H. Doherty, "A new high efficiency power amplifier for modulated wave", Proc. IRE, vol. 24, pp. 1163-1182, Sep. 1936. https://doi.org/10.1109/JRPROC.1936.228468