Advanced design features of Doherty power amplifiers
2012
A Doherty power amplifier (DPA) is an effective
structure born in 1936 which, after a scarce revival around year
2000), had been strengthened from 2005 because its capability
to combine linear amplification with power efficiency. Despite
the conceptual simplicity of its basic operation, a lot of practical
drawbacks shrink the theoretical behavior, thus leading a
significant number of research works to overcome them. The
main objective in DPA research is to increase efficiency while
maintaining linearity and filling the specified bandwidth. This
paper presents a survey of the state of the art of DPA advanced
design aspects. After a short review of the DPA operation
principles, aspects regarding improvements for linearity, power
efficiency and amplification bandwidth are introduced. Besides,
some alternative structures and technologies, as well as practical
design aspects and some trade-offs which the designer usually
has to face are also presented.
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