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Article: A Doherty amplifier with a bias adaptation technique based on SDR transmitter architecture.(TECHNICAL FEATURE)
- Article from:
- Microwave Journal
- Article date:
- September 1, 2005
- Author:
CopyrightCOPYRIGHT 2005 Horizon House Publications, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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This article presents a Doherty amplifier with a bias adaptation technique based on a software-defined radio (SDR) transmitter architecture. The SDR transmitter system performs frequency up-conversion and quadrature modulation functions for a CDMA2000 baseband signal and generates an envelope power signal using a digital signal processor (DSP). The digital intermediate frequency (IF) signal from the DSP is converted into an analog signal by a digital-to-analog converter (DAC) before the RF transmitter block. The digital envelope signal is transformed to a real-time bias adaptation signal by the mapping function of the DSP; the adaptation signal is then coupled to the gate ...
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Article: British Inventor Develops Doherty Amplifier
US Fed News Service, Including US State News;
November 29, 2007 ;
570 words
... ... Ian Mobbs of Ilkley, Great Britain, has developed a Doherty amplifier. An abstract of the invention, released by the U.S. Patent & Trademark Office, said: "A Doherty amplifier is described which comprises: a power splitter having ...
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