Miniature Design Technique of Stabilized C-Band p-HEMT MMIC Doherty Power Amplifier with Lumped Element Load Modulator

• YOSHIDA Tsuyoshi

  The University of Electro-Communications

• TAKAYAMA Yoichiro

  The University of Electro-Communications

• ISHIKAWA Ryo

  The University of Electro-Communications

• HONJO Kazuhiko

  The University of Electro-Communications

Abstract

A broadband miniature GaAs p-HEMT MMIC Doherty power amplifier (DPA) with a series connected load operating at the C band has been developed. To minimize the circuit size, a lumped-element load modulation circuit without a quarter wavelength transmission line has been introduced to MMIC technology. For both an input and output power divider/combiner circuit, two baluns are used to reduce the length of the phase adjuster circuit without causing instability. An inherent DPA instability problem related with the degenerated sub-harmonic frequency has been analyzed with the S and T parameters of DPA circuit components, resulting in a novel stabilized circuit. The developed stabilized DPA delivered a maximum power added efficiency (PAE) of 49% and a maximum output power of 23.4dBm. Greater than 40% PAE below a 10-dB input back-off from a saturated output power is obtained for a frequency range of 6.1 to 6.8GHz.

Journal

• IEICE Transactions on Electronics

  IEICE Transactions on Electronics E99.C (10), 1130-1139, 2016

  The Institute of Electronics, Information and Communication Engineers

Keywords

• doherty amplifier
• microwave
• power amplifier
• GaAs HEMT
• series connected load type
• MMIC
• broadband

Details

• CRID: 1390282679356641536
• NII Article ID: 130005598141
• DOI: 10.1587/transele.e99.c.1130
• ISSN: 17451353
• ISSN: 09168524
• Web Site: https://www.jstage.jst.go.jp/article/transele/E99.C/10/E99.C_1130/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed