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

Analog predistortion RF high power amplifier design

Author FangXiaoHu
Tutor WuGuoAn
School Huazhong University of Science and Technology
Course Microelectronics and Solid State Electronics
Keywords PA Linear Technology Analog predistortion
CLC TN722.75
Type Master's thesis
Year 2011
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Power amplifier can power signal amplification in order to launch a wireless communication system is one of the core components , the linearity and efficiency has always been the focus of attention . Nonlinear distortion be a wireless communication system to produce many adverse effects, such as the transmission modulation signal constellation shifted , eye closure causes difficulties demodulation , bit error rate increases ; within the bandwidth of the modulated signal power to the adjacent channel leakage , thereby interfering with adjacent channel communications. Although the application of power back-off method can improve the linearity, but it will be a corresponding reduction in efficiency. Therefore, a more advanced linearization techniques , while ensuring the efficiency, reduce the nonlinear distortion. This paper first introduces the basic amplifier design theory and common nonlinear effects , focusing on the amplifier memory effect and reduces memory effect method , and then introduces several common principles linearization technique and the corresponding advantages and disadvantages , indicating analog predistortion technology superiority. Based on the design specifications , the paper analog predistortion power amplifier design and simulation. Gives the driver stage and the main steps of the detailed design of the power amplifier , and the analog predistorter each module , a special study , detailing the non-linear generators , phase shifters , attenuators, delay the principles and conduct the simulation. Finally, the analog predistortion system based on the design , the production of the analog pre- distortion power amplifier 120W and debug the system and measurement . Ultimately output 120W , the two-tone signal frequency spacing 100KHz to 2.5MHz range, the system third-order intermodulation are less than -40dBc; dual tone frequency interval 2.5MHz in place, output 120W , the third-order intermodulation (IMD3) improved 10dB power added efficiency of greater than 30%. Power amplifier linearity and efficiency have been some improvements , to meet the design specifications .

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