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Dual-Band Class-F Power Amplifier based on dual-band transmission-lines  

Lee, Chang-Min (Dept. of Electronics Eng., Hankuk Univ. of Foreign Studies)
Park, Young-Cheol (Dept. of Electronics Eng., Hankuk Univ. of Foreign Studies)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.47, no.4, 2010 , pp. 31-37 More about this Journal
Abstract
In this paper, highly efficient dual-band class-F power amplifiers(PAs) for cellular and WLAN bands are suggested and implemented. For the first step, single-band class-F amplifiers at 840MHz, 2.4GHz are designed using commercial E-pHEMT FETs. The performance of two single band PAs are as much as 81.2% of efficiency with the output power of 24.4dBm with 840MHz PA and 93.5% of efficiency with 22.4dBm from the 2.4GHz. For the dual-band class-F PA, the harmonic controlling circuit with ideal SPDT switch was suggested. The length of transmission line is variable by a SPDT switch. As a results, the operation in 840MHz showed the peak efficiency of 60.5% with 23.5dBm, while in 2.4GHz mode the efficiency was 50.9% with the output power of 19.62dBm. Besides, it is shown that the harmonic controller of class-F above 2Ghz could be implemented on the low cost FR-4 substrate.
Keywords
Class-F; efficiency; power amplifier; dual-band;
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