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High‐efficiency inverse class‐E power amplifier with envelope tracking technique
Author(s) -
Kam SangHo,
Kwon OhSeung,
Lee MunWoo,
Jeong YoonHa
Publication year - 2013
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.27420
Subject(s) - amplifier , dbm , power added efficiency , microwave , electrical engineering , wimax , power (physics) , materials science , linearity , electronic engineering , high electron mobility transistor , inverse , rf power amplifier , engineering , optoelectronics , physics , transistor , telecommunications , mathematics , cmos , wireless , voltage , geometry , quantum mechanics
This letter describes a highly efficient inverse class‐E power amplifier (PA) with an envelope tracking (ET) technique.To enhance efficiency performances, the PA uses a harmonic control network with double composite right/left‐handed transmission lines. The use of the ET technique also results in high efficiency for the modulated signals. For verifications, the inverse class‐E PA is implemented with a 35‐W GaN HEMT and tested using 3.5 GHz continuous wave (CW) and 802.16e WiMAX signals. With the CW signal, a peak drain efficiency of 79.0% with a power gain of 9.8 dB is achieved at a saturation output power of 45.6 dBm. With WiMAX signals, a drain efficiency of 37.8% with a power‐added efficiency (PAE) of 33.6% is achieved at an average output power of 36 dBm, which is the 9.6 dB back‐off power region, using the ET technique. After the DPD technique, the linearity significantly improved without decreasing efficiency. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:866–869, 2013; View this article online at wileyonlinelibrary.com. DOI: 10.1002/mop.27420