Novel Design Space of Broadband High-Efficiency Parallel-Circuit Class-EF Power Amplifiers

This article proposes a broadband high-efficiency parallel-circuit (PC) class-EF power amplifier (PA) along with a quarter-wavelength stub for the first time. By adding a reactive element {X} , the design space is expanded so that the impedance terminations of the fundamental and harmonics are no l...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems. I, Regular papers Regular papers, 2022-09, Vol.69 (9), p.3465-3475
Main Authors: Liu, Chang, Zhang, Hao, Chen, Wenhua, Ghannouchi, Fadhel M.
Format: Article
Language:English
Subjects:
Broadband
Broadband communication
Chebyshev approximation
Circuit design
class-EF
design space
high-efficiency
Impedance
Inductance
Mathematical models
parallel-circuit
Power amplifiers
Power gain
Switches
Transistors
Voltage
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Summary:This article proposes a broadband high-efficiency parallel-circuit (PC) class-EF power amplifier (PA) along with a quarter-wavelength stub for the first time. By adding a reactive element {X} , the design space is expanded so that the impedance terminations of the fundamental and harmonics are no longer fixed points. Based on the broadband capability of the proposed structure, using a GaN HEMT transistor, a proof-of-concept circuit implemented with the Chebyshev impedance transformation network is designed and fabricated. Experimental results demonstrate a high-efficiency broadband PA operating from 2.6-3.9 GHz, with the average efficiency of 71.5%, the measured output power ( {P}_{\textit {out}} ) of 38.8-40.9 dBm and the power gain of 8.5-10.6 dB.
ISSN:1549-8328
1558-0806
DOI:10.1109/TCSI.2022.3177283