This paper presents the theoretical analysis of phase distortion (AM/PM) mechanisms in
Gallium Nitride (GaN) Doherty power amplifiers (DPAs) and a novel approach to optimize
the tradeoff between linearity and efficiency. In particular, it is demonstrated how it is
possible to mitigate the AM/PM by designing a suitable mismatch at the input of the active
devices, based on the identification of constant AM/PM and gain contour circles. The
proposed theory is experimentally confirmed by source-and load-pull measurements and …

This paper presents the theoretical analysis of phase distortion (AM/PM) mechanisms in
Gallium Nitride (GaN) Doherty power amplifiers (DPAs) and a novel approach to optimize
the tradeoff between linearity and efficiency. In particular, it is demonstrated how it is
possible to mitigate the AM/PM by designing a suitable mismatch at the input of the active
devices, based on the identification of constant AM/PM and gain contour circles. The
proposed theory is experimentally confirmed by source-and load-pull measurements and …