Journal of electromagnetic engineering and science

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Highly Linear 2-Stage Doherty Power Amplifier Using GaN MMIC

  • Jee, Seunghoon (Department of Electrical Engineering, Pohang University of Science and Technology (POSTECH)) ;
  • Lee, Juyeon (Department of Electrical Engineering, Pohang University of Science and Technology (POSTECH)) ;
  • Kim, Seokhyeon (Department of Electrical Engineering, Pohang University of Science and Technology (POSTECH)) ;
  • Park, Yunsik (Department of Electrical Engineering, Pohang University of Science and Technology (POSTECH)) ;
  • Kim, Bumman (Department of Electrical Engineering, Pohang University of Science and Technology (POSTECH))
  • Received : 2014.09.17
  • Accepted : 2014.11.05
  • Published : 2014.12.30
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Abstract

A power amplifier (PA) for a femto-cell base station should be highly efficient, linear and small. The efficiency for amplification of a high peak-to-average power ratio (PAPR) signal was improved by designing an asymmetric Doherty PA (DPA). The linearity was improved by applying third-order inter-modulation (IM3) cancellation method. A small size is achieved by designing the DPA using GaN MMIC process. The implemented 2-stage DPA delivers a power-added efficiency (PAE) of 38.6% and a gain of 33.4 dB with an average power of 34.2 dBm for a 7.2 dB PAPR 10 MHz bandwidth LTE signal at 2.14 GHz.

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