Highly Efficient Doherty Linear Amplifier with Input Power Allocation Control for Portable Radio(<Special Section>Analog Circuit and Device Technologies)
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概要
- 論文の詳細を見る
This paper proposes a new configuration of the Doherty amplifier by introducing digital signal processing that realizes a high efficiency over a wide range of output power. The configuration includes two branches; one branch has a class AB amplifier as the carrier amplifier and the other has two class B amplifiers in cascade as the peak amplifier. Each branch is directly controlled by the digital signal processing unit. The unit controls input power allocation to each branch by a method derived from equations characterizing the carrier and the peak constituent amplifiers. The method includes the compensation of the amplifier for degradation due to nonlinearities. The output power of each constituent amplifier is adjusted by drain DC biases. Calculated characteristics agree well with those obtained by the measurement of a fabricated proposed amplifier, whose efficiency is higher than that of the conventional class AB power amplifiers. Furthermore, a simulation for the OFDM signal specified by the radio LAN shows that the amplifier has sufficient linearity, and that thee efficiency exceeds 20% at the output of 20 dBm.
- 社団法人電子情報通信学会の論文
- 2004-06-01
著者
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Suzuki Hisamitsu
Nec Corporation
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FUKAWA Kazuhiko
Tokyo Institute of Technology
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SUZUKI Hiroshi
Tokyo Institute of Technology
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Fukawa Kazuhiko
Tokyo Inst. Of Technol. Tokyo Jpn
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Fukawa K
Tokyo Inst. Technol. Tokyo Jpn
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Suzuki H
Ntt Photonics Labs. Ntt Corporation
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Ogino Tsuyoshi
Taiyo Yuden Co. Ltd.
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Fukawa Kazuhiko
Graduate School Of Science And Engineering Tokyo Institute Of Technology
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IIZUKA Fumitaka
Tokyo Institute of Technology
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Iizuka Fumitaka
Tokyo Institute Of Technology:taiyo Yuden Co. Ltd.
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