Open AccessLower‐frequency feedback dual‐band PA with very high efficiency
Author(s) -
Qi Tian,
He Songbai
Publication year - 2018
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2017.3269
Subject(s) - multi band device , harmonics , amplifier , power (physics) , frequency band , dual (grammatical number) , q band , electrical engineering , physics , electronic engineering , materials science , control theory (sociology) , optoelectronics , engineering , computer science , telecommunications , control (management) , voltage , art , literature , cmos , quantum mechanics , artificial intelligence , antenna (radio)
A novel approach to achieve high‐efficiency dual‐band power amplifier (PA) is presented. Owing to the contradictions among the control of harmonics, most reported dual‐band or multi‐band PAs are intentionally avoiding the case when the higher‐frequency band overlaps the second harmonics of the lower‐frequency band, especially when f higher = 2 f lower . By introducing lower‐frequency feedback technique a method is proposed, make a compromise between high‐efficiency and power gain fluctuant, high‐efficiency dual‐band PA at the above condition can be achieved. To verify, a dual‐band PA operating at 1.7 and 3.4 GHz is fabricated and measured. The peak output powers of the dual‐band are 40.1 and 40.7 dBm with small signal gains 25 and 17 dB, and the drain efficiency at the peak output power reached 80.2 and 78.5%, respectively.