Research On Broadband And Efficient Power Amplifier For 5G Communication System

With the continuous development of wireless communication system technology,limited spectrum resources are becoming more and more crowded.In order to cope with different scenarios such as continuous wide area coverage,hot spots,high capacity,low delay,high reliability,low power consumption and large connection,the new generation fifth communication technology(5G)came into being.5G has a higher demand for the bandwidth of the communication system.On the other hand,with the surge in the number of communication devices,the problem of energy consumption has become increasingly severe.Energy conservation and environmental protection is not only a hot topic nowadays,but also a trend of future development.As the most important and energy consuming device in the communication system,the power amplifier limits the bandwidth of the entire communication system,and its efficiency determines the overall efficiency of the communication system.Therefore,the research direction of high efficiency broadband power amplifier for 5G communication system is established in this paper.The main work is as follows:(1)In this paper,we analyze the basic theory of power amplifier,according to broadband matching theory and load pull technique using source,obtained broadband impedance matching space,and then developed a job at 3.3-4.2GHz,a power output of more than 36 dBm,the gain is greater than 13 dB,the power amplifier efficiency of more than 50%.On this basis,we further developed a 3.4-4.3GHz two level cascade power amplifier,whose output power is over 35 dBm,the gain is more than 30 dB,and the efficiency is over 48%.At the same time,there is no need to introduce additional isolators between the two amplifiers.These two designs all use CREE's CGHV1F006 S to achieve the design goal of broadband and high gain amplifier in the 5G band.(2)In this paper,the basic principle of the continuous inverse class F power amplifier is studied.In the current and voltage equations,new parameters are introduced.The real harmonic solution space can be obtained and the bandwidth can be further expanded.On this basis,a broadband high-efficiency power amplifier operating at 2.5-4.1GHz and output power of 9.1-18.4 W was developed,achieving an average efficiency of over 60%.This design uses CREE's CGH60015 D die to achieve the goal of designing broadband high-efficiency power amplifiers in the 4G reserved band and 5G mid-band.(3)In this paper,the basic principles of traditional Doherty and its bandwidth limitations are analyzed.By using post-matching technology,the introduction of a high-impedance ?/4 converter is avoided,and the bandwidth is extended.On this basis,a broadband high-efficiency Doherty power amplifier operating at 2.4-3.4 GHz was developed.Its saturated output power was greater than 43 dBm,and the efficiency of back-off 6 d B exceeded 45%.This design uses CREE's CGH10010 F to successfully achieve the design goal of 4G reserved frequency band and 5G mid-band broadband high-efficiency power amplifier.