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指導教授 : 林志明 系級 : 積 體所 研一 姓名 : 黃政德

An Intelligent Power Amplifier MMIC Using a New Adaptive Bias Control Circuit for W-CDMA Applications. IEEE JOURNAL OF SOLID-STATE CIRCUITS, VOL. 39, NO. 6, JUNE 2004. 指導教授 : 林志明 系級 : 積 體所 研一 姓名 : 黃政德. Introduction. W-CDMA MMIC HBT

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指導教授 : 林志明 系級 : 積 體所 研一 姓名 : 黃政德

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  1. An Intelligent Power Amplifier MMIC Using a New Adaptive Bias Control Circuit for W-CDMA Applications IEEE JOURNAL OF SOLID-STATE CIRCUITS, VOL. 39, NO. 6, JUNE 2004 指導教授:林志明 系級:積體所 研一 姓名:黃政德

  2. Introduction • W-CDMA • MMIC • HBT • Adaptive Bias Control Circuit

  3. Block diagram of the adaptive bias control system

  4. Schematic diagram of the adaptive bias control circuit

  5. Simulated collector current of HBT3

  6. Simulated collector current of HBT3

  7. Photograph of the fabricated HBT MMIC power amplifier

  8. Measured gain and ACLR of the power amplifier

  9. Measured collector current of the power amplifier

  10. Measured ACLR of the power amplifier

  11. MEASURED PERFORMANCES

  12. REFERENCES • [1] T. Fowler, K. Burger, C. Nai-Shuo, A. Samelis, E. Enobakhare, and S.Rohlfing, “Efficiency improvement techniques at low power levels forlinear CDMA and WCDMA power amplifiers,” in IEEE RFIC Symp.Dig., June 2002, pp. 41–44. • [2] G. Hanington, P.-F. Chen, P. M. Asbeck, and L. E. Larson, “High-efficiency power amplifier using dynamic power-supply voltage for CDMA applications,”IEEE Trans. Microwave Theory Tech., vol. 47,pp. 1471–1476, Aug. 1999. • [3] T. B. Nishimura, N. Iwata, and G. Hau, “Wide-band CDMA highly efficient heterojunction FET over wide range output power with DC-DCconverter,” in IEEE MTT-S Int. Microwave Symp. Dig., vol. 3, June 1999,pp. 1091–1094. • [4] K. Yang, G. I. Haddad, and J. R. East, “High-efficiency class-A power amplifiers with a dual-bias-control scheme,”IEEE Trans. Microwave Theory Tech., vol. 47, pp. 1426–1432, Aug. 1999. • [5] J. Staudinger, “Applying switched gain stage concepts to improve efficiency and linearity for mobile CDMA power amplification, ”Microwave J., vol. 43, no. 9, pp. 152–162, Sept. 2000. • [6] Y. S. Noh and C. S. Park, “PCS/W-CDMA dual band MMIC power amplifier with a newly proposed linearizing bias circuit,”IEEE J. Solid-State Circuits, vol. 2, pp. 1096–1099, Sept. 2002.

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