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Design of novel high‐efficient DPA using ACL‐loaded SIR for linearity improvement
Author(s) -
Xia ZuXue,
Cao Xin
Publication year - 2019
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.31768
Subject(s) - linearity , intermodulation , materials science , amplifier , resonator , electrical impedance , electrical engineering , impedance matching , electronic engineering , optoelectronics , engineering , cmos
In this article, a novel high‐efficient Doherty power amplifier (DPA) is designed for linearity improvement from 2.1 to 2.4 GHz. The proposed DPA employs a pair of anti‐coupled lines loaded with a stepped impedance resonator to replace the λ /4 transmission line in the conventional DPA for harmonic suppression, phase compensation, and impedance transformation. The DPA is simulated, fabricated, and measured. As the measured results show, in the 2.1‐2.4 GHz band, the saturated output power is between 43.2 and 44.5 dBm with the saturated gain level between 10.2 and 11.5 dB. The saturated drain efficiency (DE) is between 60% and 70% with DE at 6 dB output power back‐off between 38% and 50%. Compared with the conventional DPA, the third‐order intermodulation distortion is reduced by 20 dB. The efficiency and gain have also been improved. The proposed DPA is feasible and applicable in modern wireless communication systems.