Sharif Digital Repository

This paper presents the theoretical introduction and experimental validation of the "Class-J2 Mode Power Amplifier," which provides higher efficiency and output power compared with conventional class-J mode counterpart. This mode of operation is realized by injection of the second-harmonic current to drain node of a class-J power amplifier (PA) to reduce the 45° phase shift between drain current and voltage signals. Similar to class-J PAs, the second-harmonic impedance of class-J2 PAs is purely reactive to simplify the design of the output matching network. The auxiliary second-harmonic injection circuit comprises a transistor biased in class-B mode followed by a class-C biased amplifier to... 

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... 

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...