2013•IEEE Transactions on Microwave Theory and TechniquesRequires access

A Modified Doherty Power Amplifier With Extended Bandwidth and Reconfigurable Efficiency

David Gustafsson, Christer M. Andersson, Christian Fager

Abstract

This paper derives the theory and presents measurements of a new power amplifier based on the Doherty power amplifier topology. It is theoretically shown that the proposed amplifier can simultaneously provide high efficiency at both full output power and at output power back-off, over a much improved bandwidth compared to the conventional Doherty power amplifier. It is also shown that the proposed amplifier allows reconfiguration of the efficiency in power back-off without the need of tunable elements.

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Key concepts: Power bandwidth, Amplifier, Linear amplifier, Direct-coupled amplifier, RF power amplifier, Power-added efficiency, Doherty amplifier, Electronic engineering