1. 1 Power Amplifier With Low Average Current and Compact Output Matching Network 指導老師 : 林志明 學生 : 黃政德 系級 : 積體所研一 IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS, VOL. 15, NO. 11, NOVEMBER 2005 Youngoo Yang, Member, IEEE

2. 2 INTRODUCTION High PAE For CDMA, Pout=16 or 28dBm Goal is to boost the efficiency and reduce average current A new simple output matching network

3. 3 Schematic diagram of the power amplifier with active bias and control blocks

4. 4 Output matching network based on a high-pass topology

5. 5 S-parameter simulation results

6. 6 Die photo processed with InGaP/GaAs HBT technology

7. 7 Measured quiescent currents

8. 8 Measured small-signal gains

9. 9 Measured ACPR1

10. 10 Measured PAE and collect current

11. 11 COMPARISON OF AVERAGE CURRENT CONSUMPTION AND PAE

12. 12 CONCLUSION The advantages of a low-cost design and reduced current consumption. A high-pass impedance matching circuit. The proposed PA provides a significant improvement in the PAE for an average power- usage.

13. 13 REFERENCES [1] Y. Yang, “High efficiency CDMA power amplifier with dynamic current control circuits,” in IEEE Compound Semiconductor Integrated Circuit Symp. Dig., Oct. 2004, pp. 53–56. [2] G. Hanington, P. Chen, P. M. Asbeck, and L. E. Larson, “High-efficiency power amplifier using dynamic power-supply voltage for CDMA applications,” IEEE Trans. Microw. Theory Tech., vol. 47, no. 8, pp.1471–1476, Aug. 1999. [3] Y. Yang, J. Cha, B. Shin, and B. Kim, “A microwave Doherty amplifier employing envelope tracking technique for high efficiency and linearity,” IEEE Microw. Wireless Compon. Lett., vol. 13, no. 9, pp.370–372, Sep. 2003. [4] Y.Yang, K. Choi, and K. P.Weller, “DC boosting effect of active bias circuits and its optimization for class-AB InGaP-GaAs HBT power ampli- fiers,” IEEE Trans. Microw. Theory Tech., vol. 52, no. 5, pp. 1455– 1463,May 2004.