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Efficiency Improvement for Dual Mode Amplifier Design Using Bias Switching  

Lee Young-Min (Dept. of Electronics Eng., University of Incheon)
Koo Kyung-Heon (Dept. of Electronics Eng., University of Incheon)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.43, no.8, 2006 , pp. 97-102 More about this Journal
Abstract
This paper presents a novel technique of efficiency enhancement for dual mode transmitter. The future dual mode transmitter incorporates an amplifier which generates different level of output for different applications. For WiBro, the output is 1W at 2.3GHz, and for wireless LAN, the output is less than 100mW at 2.4GHz. Simple bias switching is proposed to get the higher efficiency at both of the applications. Without the bias switching the amplifier shows 10% PAE at 20dBm output for wireless LAN, but using a preselected lower bias, the efficiency improves up to 35%. This technique becomes more useful as the need of many function convergence terminals is increasing.
Keywords
Power Amplifier; Bias switching; WiBro; Wireless LAN;
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