Abstract
This chapter describes the historical aspect of the Doherty approach to the power amplifier design and modern trends in Doherty amplifier (DA) design techniques using multistage and asymmetric multiway architectures. To increase efficiency over the power-backoff range, the switchmode Class-E, conventional Class-F, or inverse Class-F operation mode by controlling the second and third harmonics can be used in the load network. The DA with a series connected load, inverted, balanced, push-pull, and dual Doherty architectures are also described and discussed. Finally, examples of the integrated and monolithic DAs for sub-6-GHz and millimeter-wave applications, digitally driven Doherty technique, and broadband capability of the conventional and inverted DAs are given.
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