Efficiency enhancement of the Doherty amplifier for 3.5 GHz WiMAX application using class-F circuitry

Jun Chul Park, Dongsu Kim, Chan Sei Yoo, Woo Sung Lee, Jong Gwan Yook, Cheol Koo Hahn

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

This article presents a high-power and high-efficiency saturated Doherty amplifier using a GaN high electron mobility transistor for 3.5 GHz Worldwide Interoperability for Microwave Access application. The saturated Doherty amplifier is a Doherty amplifier based on class-F amplifiers, resulting in higher efficiency than a conventional Doherty amplifier. The distributed-type harmonic control circuit is located between a power transistor and an output matching circuit. From the measured results for a continuous wave of 3.5 GHz, the saturated Doherty amplifier attains a high P3dB of 45 dBm and a power gain of about 8.8 dB. Also, the proposed Doherty amplifier provides a high power-added-efficiency (PAE) of 37.7% and a drain efficiency of 42.7% at 6-dB back-off output power region from P3dB, which are 8.7% and 5.7% higher than those of the conventional Doherty amplifier. Compared to the single class-AB amplifier, we obtain 17.7% and 19.7% improvement of PAE and drain efficiency, respectively.

Original languageEnglish
Pages (from-to)570-573
Number of pages4
JournalMicrowave and Optical Technology Letters
Volume52
Issue number3
DOIs
Publication statusPublished - 2010 Mar 1

Fingerprint

Doherty amplifiers
amplifiers
augmentation
power efficiency
Wimax
harmonic control
Networks (circuits)
High electron mobility transistors
interoperability
power gain
output
high electron mobility transistors
continuous radiation
transistors

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

Park, Jun Chul ; Kim, Dongsu ; Yoo, Chan Sei ; Lee, Woo Sung ; Yook, Jong Gwan ; Hahn, Cheol Koo. / Efficiency enhancement of the Doherty amplifier for 3.5 GHz WiMAX application using class-F circuitry. In: Microwave and Optical Technology Letters. 2010 ; Vol. 52, No. 3. pp. 570-573.
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Efficiency enhancement of the Doherty amplifier for 3.5 GHz WiMAX application using class-F circuitry. / Park, Jun Chul; Kim, Dongsu; Yoo, Chan Sei; Lee, Woo Sung; Yook, Jong Gwan; Hahn, Cheol Koo.

In: Microwave and Optical Technology Letters, Vol. 52, No. 3, 01.03.2010, p. 570-573.

Research output: Contribution to journalArticle

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