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Effects of Drain Bias on Memory-Compensated Analog Predistortion Power Amplifier for WCDMA Repeater Applications

  • Lee, Yong-Sub (Department of Electronic and Electrical Engineering, Pohang University of Science and Technology) ;
  • Lee, Mun-Woo (Department of Electronic and Electrical Engineering, Pohang University of Science and Technology) ;
  • Kam, Sang-Ho (Department of Electronic and Electrical Engineering, Pohang University of Science and Technology) ;
  • Jeong, Yoon-Ha (Department of Electronic and Electrical Engineering, Pohang University of Science and Technology)
  • Published : 2009.06.30

Abstract

This paper represents the effects of drain bias on the linearity and efficiency of an analog pre-distortion power amplifier(PA) for wideband code division multiple access(WCDMA) repeater applications. For verification, an analog predistorter(APD) with three-branch nonlinear paths for memory-effect compensation is implemented and a class-AB PA is fabricated using a 30-W Si LOMaS. From the measured results, at an average output power of 33 dBm(lO-dB back-off power), the PA with APD shows the adjacent channel leakage ratio(ACLR, ${\pm}$5 MHz offset) of below -45.1 dBc, with a drain efficiency of 24 % at the drain bias voltage($V_{DD}$) of 18 V. This compared an ACLR of -36.7 dEc and drain efficiency of 14.1 % at the $V_{DD}$ of 28 V for a PA without APD.

References

  1. F. H. Raab, P. Asbeck, S. C. Cripps, P. B. Kenington, Z. B. Popovi$\acute{c}$, V. Pothecary, J. F. Sevic, and N. O. Sakal, "Power amplifiers and transmitters for RF and microwave", IEEE Trans. Microw. Theory Tech., vol. 50, no. 3, pp. 814-826, Mar. 2002 https://doi.org/10.1109/22.989965
  2. Y. S. Lee, M. W. Lee, G. B. Choi, and Y. H Jeong, "New analog pre distorter using mixing operation for independent control of IM3 components", Microw. Opt. Tech. Lett., vol. 49, no. 10, pp. 2552-2555, Oct. 2007 https://doi.org/10.1002/mop.22758
  3. J. Kim, Y. Y. Woo, J. Moon, and B. Kim, "A new wideband adaptive digital predistortion technique employing feedback linearization", IEEE Trans. Microw. Theory Tech., vol. 56, no. 2, pp. 385-392, Feb. 2008 https://doi.org/10.1109/TMTT.2007.914362
  4. D. F. Kimball, J. Jeong, C. Hsia, P. Draxler, S. Lanfranco, W. Nagy, K. Linthicum, L. E. Larson, and P. M. Asbeck, "High-efficiency envelope-tracking W-CDMA base-station amplifier using GaN HFETs", IEEE Trans. Aiicrow. Theory Tech., vol. 54, no. 11, pp. 3848-3856, Nov. 2006 https://doi.org/10.1109/TMTT.2006.884685
  5. Y. S. Lee, M. W. Lee, and Y. H Jeong, "Highly efficient class-F GaN HEMT Doherty amplifier for WCDMA applications", Microw. Opt. Tech. Lett., vol. 50, no. 9, pp. 2328-2331, Sep. 2008 https://doi.org/10.1002/mop.23700
  6. Y. S. Lee, M. W. Lee, and Y. H. Jeong, "High-efficiency class-F GaN HEMT amplifier with simple parasitic-compensation circuit", IEEE Microw. Wireless Compon. Lett., vol. 18, no.1, pp. 55-57, Jan. 2008 https://doi.org/10.1109/LMWC.2007.912023
  7. Y. S. Lee, S. Y. Lee, K. 1. Jcon, and Y. H. Jeong, "Highly linear predistortion power amplifiers with phase-controlled error generator", IEEE Microw. Wireless Compo. Lett., vol. 16, no. 12, pp. 690-692, 2006 https://doi.org/10.1109/LMWC.2006.885638
  8. J. Carvers, T. Johnson, "Wideband linearization: Feedforward plus DSP", in Proc. MTT-S 2004 Workshop, 2004
  9. Y. Y. Woo, Y. Yang, and B. Kim, "Analysis and experiments for high-efficiency c1ass-F and inverse class-F power amplifiers", IEEE Trans. Micrmv. Theory Tech., vol. 54, no. 5, pp. 1969-1974, May 2006 https://doi.org/10.1109/TMTT.2006.872805
  10. Y. S. Lee, M. W. Lee, and Y. H. Jeong, "Unequalcells-based GaN HEMT Doherty amplifier with an extended efficiency range", IEEE Microw. Wireless Compo. Lett., vol. 18, no. 8, pp. 536-538, Aug. 2008 https://doi.org/10.1109/LMWC.2008.2001015
  11. F. Wang, D. F. Kimball, J. D. Popp, A. H. Yang, D. Y. Lie, P. M. Asbeck, and L. E. Larson, "An improved power-added efficiency 19-dBm hybrid envelope elimination and restoration power amplifier for 802.IIg WLAN applications", IEEE Trans. Microw. Theorv Tech., vol. 54, no. 12, pp. 4086-4099, Dec. 2006. https://doi.org/10.1109/TMTT.2006.885575
  12. Y. S. Lee, M. W. Lee, and Y. H. Jeong, "Highly efficient Doherty amplifier based on class-E topology for WCDMA applications", IEEE Aiicrow. Wireless Compo. Lett., vol. 18, no. 9, pp. 608-610, Sep. 2008 https://doi.org/10.1109/LMWC.2008.2002460
  13. Y. S. Lee, Y. H. Jeong, "A high-efficiency class-E GaN HEMT power amplifier for WCDMA applications", IEEE Microw. Wireless Compon. Lett., vol. 17, no. 8, pp. 622-624, Aug. 2007 https://doi.org/10.1109/LMWC.2007.901803