Efficiency Enhancement of a Digital Predistortion Doherty Amplifier Transmitter Using a Virtual Open Stub Technique(Active Devices/Circuits,<Special Section>Microwave and Millimeter-Wave Technology)

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概要

• 論文の詳細を見る

• This paper proposes a design method of a Doherty amplifier, which can determine the most efficient backed-off point of the amplifier by adjusting a load modulation parameter. The parameter is defined through the design of output transmission line of a carrier and a peak amplifier using a virtual open stub technique. This paper describes the design results using the technique to optimize efficiency of a Doherty amplifier for an orthogonal frequency division multiplexing (OFDM) signal, and parameter adjustment for a linearized Doherty amplifier using an adaptive digital predistortion (ADPD). Applying this method, the developed 250W ADPD Doherty amplifier has achieved drain efficiency of 43.4% and intermodulation (IM) distortion of -48.3dBc with output power of 44.1dBm (10.1dB output backed-off) at 563MHz using an OFDM signal for integrated services digital broadcasting-terrestrial (ISDB-T).

• 社団法人電子情報通信学会の論文
• 2007-09-01

著者

• HORIGUCHI Kenichi

  Information Technology R&D Center, Mitsubishi Electric Corporation

• HAYASHI Ryoji

  Information Technology R&D Center, Mitsubishi Electric Corporation

• Takagi T

  Optical Interconnection Sumiden Laboratory Rwcp

• ISOTA Yoji

  Information Technology R & D Center, Mitsubishi Electric Corporation

• Takagi T

  Research Institute Of Electrical Communication Tohoku University

• Takagi T

  It-21 Center Research Institute Of Electrical Communications Tohoku University

• Takagi Tadashi

  Research Institute Of Electrical Communication Tohoku University

• ISHIZAKA Satoru

  Communication Network Center, Mitsubishi Electric Corporation

• NAKAYAMA Masatoshi

  Information Technology R & D Center, Mitsubishi Electric Corporation

• Ishizaka Satoru

  Communication Network Center Mitsubishi Electric Corporation

• Nakayama M

  Information Technology R & D Center Mitsubishi Electric Corporation

• Nakayama M

  Laboratory Of Nutrition Chemistry Division Of Bioresource And Bioenvironmental Sciences Graduate Sch

• Horiguchi Kenichi

  Information Technology R & D Center Mitsubishi Electric Corporation

• Hayashi Ryoji

  Information Technology R & D Center Mitsubishi Electric Corporation

• TAKAGI Tadashi

  Research Institute of Electric Communication (RIEC), Tohoku University

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