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Class-J₂₃ power amplifiers

Alizadeh, A ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1109/TCSI.2019.2913689
  3. Publisher: Institute of Electrical and Electronics Engineers Inc , 2019
  4. Abstract:
  5. Recently, class-J₂ operation mode has been proposed in the literature for high-efficiency power amplifier (PA) design. It has been shown that the output power (Pout) of a class-J₂ PA can be 1.5 dB higher than Pout of a class-J counterpart, whereas the theoretical drain efficiency of the class-J₂ mode can be as high as 83%. This paper is devoted to introduce and characterize the class-J₂₃ mode of operation, which is the generalized form of the class-J₂ mode and provides a new design space to realize highly efficient PSs. In this new PA mode, the third-harmonic voltage is also included in the drain voltage of the transistor to increase the drain efficiency up to 95.4% in theory. Design space is explored for the class-J₂₃ mode, and formulations are derived for the output power, drain efficiency, load impedance at the fundamental frequency, and the second- and third-harmonic load impedances. It is shown that the output power and drain efficiency of the class-J₂₃ mode remain constant for coupled variations of the fundamental and third-harmonic impedances, while the second-harmonic impedance is open-circuited. To validate the theoretical predictions, a proof-of-concept fully integrated PA is fabricated in a 0.25-μm GaAs pHEMT technology. The prototype PA features an average output power of 30.7 dBm and drain efficiency of 68% in a 2.5-3.6-GHz bandwidth. IEEE
  6. Keywords:
  7. Class-J₂ ; Continuous-mode power amplifiers ; Harmonic-injection power amplifiers ; Impedance ; Reduced conduction angle (RCA) ; Space exploration ; Efficiency ; Electric impedance ; Electrical engineering ; Gallium arsenide ; Harmonic analysis ; III-V semiconductors ; Logic gates ; Power amplifiers ; Power generation ; Space research ; Transistors ; Class J ; Conduction angle ; Continuous mode ; Harmonic injection ; High efficiency power amplifiers ; Space explorations ; Space power generation
  8. Source: IEEE Transactions on Circuits and Systems I: Regular Papers ; 2019 ; 15498328 (ISSN)
  9. URL: https://ieeexplore.ieee.org/document/8708978