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Study and Design of Doherty Power Amplifier

Author: YangSanBing
Tutor: LiuTaiJun
School: Ningbo University
Course: Communication and Information System
Keywords: Doherty amplifier Linearity Average efficiency Broadband
CLC: TN722.75
Type: Master's thesis
Year: 2009
Downloads: 205
Quote: 0
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Abstract


In the third generation mobile communication system, due to the use of some complex modulation scheme, so that the PAPR of the signal is increased, which requires as one of the main module in the communication system, the amplifier must have a good linear degrees. Now the technology can make better linearity of the amplifier, but in the end are the cost of sacrificing the efficiency of the power amplifier. While the amplifier of the communication system as a major energy consuming modules. Its level of efficiency is not only a direct impact on the efficiency and stability of the power amplifier and communication system as a whole, but also directly affect the use of time and life of the battery powered communication system. The high efficiency of the power amplifier can save not only electricity, but also reduce the the whole cooling equipment requirements. This paper presents the structure of Doherty power amplifiers in the power back-off 6dB range to maintain high efficiency, so as to solve the problem caused by reduced efficiency of the power amplifier because the power back. If can be combined with some linear technology use, such as: Doherty, feedforward technology and Doherty digital pre-distortion technology, it also has good linearity while maintaining high efficiency. In this paper, Freescale MRF281s 4-W LDMOS FETs Doherty power amplifier design. Doherty amplifier design bias circuit design, matching techniques, stability analysis and the theory of the Doherty amplifier were introduced in detail. ADS software and apply optimization design method ultimately makes the design of the power amplifier to reach the planned target, the Doherty power amplifier design compared to traditional Class AB power amplifier showed good results, based on average efficiency Doherty amplifier design methods and broadband Doherty power amplifier optimized design method, two optimization design method to solve the Doherty amplifier design, the best fallback selection and broadband Doherty power amplifier design avoids the tedious calculations. This paper is divided into seven parts, the first part is the introduction. The second section describes the basic indicators of the power amplifier and power amplifier. The third part introduces the principle of the Doherty amplifier. The fourth section describes the physical and test results of the the Doherty amplifier simulation design process and the Doherty amplifier. The fifth part of the design method based on the average efficiency of the Doherty amplifier. The sixth section briefly describes the broadband Doherty power amplifier optimized design method. Part VII of this article, the overall summary.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Basic electronic circuits > Amplification technology,the amplifier > Amplifier > Amplifiers: the role of sub- > Power amplifier
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