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

Cost- optimized design and implementation of RF power amplifier

Author WangChengXin
Tutor GuoWei
School Huazhong University of Science and Technology
Course Electromagnetic Field and Microwave Technology
Keywords Optimization PA Linear Technology Feedforward
CLC TN722.75
Type Master's thesis
Year 2011
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With the rapid development of wireless communication technology , wireless communications products with more and more closely related to people's lives . As a wireless communication system, an important support technology of the RF power amplifier design techniques have been innovation . RF power amplifier design is moving broadband, high linearity , high efficiency forward direction . And because of various variable envelope digital modulation techniques widely used, the amplifier linearity requirements of particular urgency . Feedforward linearization technique is the large number of the most popular techniques and proved to be the most promising technologies. This paper presents a technique using feedforward design work on the CDMA network down , low-cost power amplifier. This paper describes the importance of high linearity power amplifier , and through comparative analysis of current popular power amplifier design techniques drawn feedforward technology advantage. The second part describes the key indicators of the power amplifier , power amplifier classification and stability of the judgment. The third part introduces the feedforward order system works , the design of the overall program and the specific circuit unit design . These include the device selected, the input part of the circuit design, power supply parts of the circuit design , the detector circuit design , automatic level control circuit design, the main signal cancellation loop amplifier simulation and design , the design of the distortion signal amplifier . The last part gives the product assembly and debugging considerations , and product measured data . The maximum output power amplifier design can reach 45dBm, third-order intermodulation less than -55dBc, adjacent channel power ratio can be achieved -47dBc and -61dBc. But the system remains to be simplified , and certain indicators can also be improved, which are needed in the future work to perfect . Its main tasks are : first, the launch of the Agilent ADS simulation software selection amplification tube simulation ; followed and the part of the overall program design system specific circuit ; Finally, the design of products for assembly , commissioning and testing.

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