ABSTRACT
Spectrally efficient modulations with large peak-to-average-power ratios (PAPR) are widely employed in many high-performance wireless communication systems from low-GHz radios to mm-Wave links. This growing trend has posed stringent requirements on next-generation power amplifier (PA) designs and transmitter architectures. Going beyond more conventional PA designs that mostly focus on peak output power and efficiency, next-generation PA solutions should achieve both power efficiency and linearity in the entire power back-off region (PBO) to amplify the large-PAPR signals with high efficiency and fidelity. Doherty architecture is recently gaining an increasing interest due to its PBO efficiency enhancement and its compatibility with broadband and linear amplifications. This tutorial presentation will first introduce the Doherty PA and its operation principle.
