DOI QR코드

DOI QR Code

Efficiency Improvement of HBT Class E Power Amplifier by Tuning-out Input Capacitance

  • Kim, Ki-Young (School of Engineering, Information and Communications University) ;
  • Kim, Ji-Hoon (School of Engineering, Information and Communications University) ;
  • Park, Chul-Soon (School of Engineering, Information and Communications University)
  • 발행 : 2007.12.31

초록

This paper demonstrates an efficiency improvement of the class E power amplifier (PA) by tuning-out the input capacitance ($C_{IN}$) of the power HBT with a shunt inductance. In order to obtain high output power, the PA needs the large emitter size of a transistor. The larger the emitter size, the higher the parasitic capacitance. The parasitic $C_{IN}$ affects the distortion of the voltage signal at the base node and changes the duty cycle to decrease the PA's efficiency. Adopting the L-C resonance, we obtain a remarkable efficiency improvement of as much as 7%. This PA exhibits output power of 29 dBm and collector efficiency of 71% at 1.9 GHz.

키워드

참고문헌

  1. N.O. Sokal and A.D. Sokal, 'Class E-a new Class of high efficiency tuned signle-ended switching power amplifiers,' IEEE J. Solid-State Circuits, vol. SC-10, no. 3, pp. 168-176, June 1975
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  3. J.R. Kim, J.H. Kim, Y.S. Noh and C.S. Park, 'An InGaP/GaAs HBT MMIC smart power amplifier for W-CDMA mobile handsets,' IEEE J. Solid-State Circuits, vol. 38, no. 6, pp. 905-910, Jun. 2003 https://doi.org/10.1109/JSSC.2003.811869
  4. J.H. Kim, K.Y. Kim, Y.H. Choi and C.S. Park, 'A power efficient W-CDMA smart power amplifier with emitter area adjusted for output power levels,' IEEE MTT-S Int. Microwave Symp. Dig., Jun. 2004, pp.1163-1166
  5. G.K. Wong, S.I. Long, 'An 800MHz HBT Class-E amplifier with 74% PAE at 3.0 volts for GMSK,' IEEE GaAs IC Symp. Tech. Dig., Oct. 1999, pp. 299-302
  6. D. Milosevic, J. Tang and A. Roermund, 'A highefficiency HBT-based class-E power amplifier for 2 GHz,' in Proc. EGAAS Symp., Oct. 2005, pp. 45-48
  7. E.A. Jarvinen and M.J. Alanen, 'GaAs HBT class-E amplifiers for 2-GHz mobile applications,' in Proc. IEEE RFIC Symp., Jun. 2005, pp. 421-424
  8. K.Y. Kim, J.H. Kim, Y.S. Noh and C.S. Park, 'Cellular/ PCS dual-band MMIC power amplifier of a newly devised single-input single-chain network,' IEEE GaAs IC Symp. Tech. Dig., Nov. 2003, pp. 131-134
  9. K.Y. Kim, J.H. Kim, S.M. Park and C.S. Park, 'Parasitic capacitance optimization of GaAs HBT Class E power amplifier for high efficiency CDMA EER transmitter,' in Proc. IEEE RFIC Symp., Jun. 2007, pp. 733-736

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