A novel Doherty power amplifier with self-adaptive biasing network for efficiency improvement

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  • Shichang Chen
  • Quan Xue


Original languageEnglish
Pages (from-to)2586-2589
Journal / PublicationMicrowave and Optical Technology Letters
Issue number11
Publication statusPublished - Nov 2011


A Doherty power amplifier (DPA) with a self-adaptive biasing circuit is presented in this letter. The proposed structure is integrated into the gate biasing network of the peaking power amplifier (PA), and then the gate voltage can be adaptively adjusted with the input power. Due to the presence of this simple but effective circuit, the peaking PA can approach the ideal power transfer characteristic which results in better efficiency than the conventional design with constant biasing. The proposed circuit is implemented and compared with both the conventional DPA and a single Class-AB PA. 12% and 34% power added efficiency improvements are achieved at 6 dB backoff © 2011 Wiley Periodicals, Inc.

Research Area(s)

  • Doherty power amplifier, peak-to-average power ratio, self-adaptive biasing, soft tune-on