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The Design of a Predistortion Power Amplifier Based on Improved DGS

Author: ZhangJunQing
Tutor: YouBin
School: Hangzhou University of Electronic Science and Technology
Course: Circuits and Systems
Keywords: RF power amplifier Load-pull system Analog predistortion circuit Defected ground structure
CLC: TN722.75
Type: Master's thesis
Year: 2011
Downloads: 56
Quote: 0
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Abstract


With modern society, people increasingly high demand for mobile communication services, the band resources appear inevitable shortage, severely limiting the rapid development of mobile communications. The high data transmission rates and high utilization efficiency of the spectrum resources is an effective way to solve this problem, so the modern communication systems use more high-speed, wide variation with a peak than the modulation signal, so that the mobile communication system in the radio-frequency part of the proposed higher requirements, posed a challenge especially sensitive to the design of high-power RF amplifiers. RF power amplifiers in many systems tend to use power back-off technique to improve the linearity, but this linearity has improved to a certain extent, but the efficiency will be a serious deterioration, so the study of high efficiency and high linearity RF power amplifier imminent. Are difficult problems in RF circuit design has been due to the lack of large signal parameters, power tube amplifier design, the study of several of the RF power amplifier design method based on a three Load-pull test platform design RF power amplifier system. The test results show that the amplifier design in this article has reached a predetermined design specifications and requirements. Compared to other amplifier design, Load-pull test platform can be directly measured input and output impedance of power tubes in large-signal operation, amplifier design provides intuitive signal parameters, Load-pull test platform used in conjunction with the ADS software can be simplify the design process of the power amplifier, improved amplifier design technology. Linearization techniques to improve amplifier linearity, the main means of improving efficiency, through the analysis of various linear technology, and considering the cost and the complexity of the circuit, analog pre-distortion technology to improve the design RF power amplifier linearity. In this paper, the design of the main part of the analog predistorter is composed by 90 degrees microstrip couplers and some nonlinear devices and third-order intermodulation signal generator, and at the same time, other signal offset the third-order intermodulation generator residual the fundamental frequency of the signal, in order to achieve the best improvement. Through the analog predistorter simulation, proved completely original design requirements can be achieved. In this paper, the design of analog predistorter has a simple structure, easy to implement, low cost, cheap, and good performance characteristics. Improve amplifier efficiency Another method is to suppress the harmonic components of the power amplifier output, the conventional methods using various filters to filter out the harmonic, the cost of this method is high, and increase the volume of the amplifier. Using defected ground structure does not increase the cost and power amplifier volume output harmonic suppression amplifier. DGS (Defected Ground Structure) a lot of research and analysis on the basis of a new structure of defects and greatly improved performance compared with the previous DGS. Paper, we present a new type of defected ground structures used in the last stage power amplifier, simulation and test results show that the novel defected ground structure without increasing the amplifier cost and size of the case, not only effectively suppress the RF power amplifier output harmonic component to improve efficiency, but also to solve the final stage amplifier drain bias line is too small.

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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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