| During the practicum period in Huawei,according to the company's work to develop the content of the school and the guidance of the teacher's request,based on the actual work involved the authort completed this paper.Modern wireless communication technology to our daily lives and economic development has undergone enormous changes.Power amplifiers in communication systems are the most important one of the modules,wireless communication technology with the rapid development of power amplifier performance have also put forward more and more demands.Power amplifier at the many indicators,the saturation output power,efficiency and linearity of RF engineers the most attention,improve the performance of these indicators is always RF Engineer diligently pursue.Doherty amplifier is one of the many technologies that improve efficiency power amplifier technologies.Because of its power from two tubes,so this technology can also improve the saturation output power amplifier combined with digital pre-distortion(DPD) technology to improve linearity,making the technology has a clear advantage,has become the amplifier technology mainstream.A lot of worldwide large-scale manufacturers of communications equipment,such as Ericsson,Nokia-Siemens, Alcatel - Lucent,Qualcomm,Huawei,ZTE,etc.,and its base station products that are there is no lack of Doherty amplifier figure.The author engaged in Doherty power amplifier research and design work of the course and found that both the technology gaps exist,these two shortcomings of the power amplifier saturation output power and efficiency of the impact of varying degrees,in order to improve its performance,response to the question of its existence, the industry put forward a modified Doherty amplifier structure—A-Doherty(that is, non-symmetrical Doherty) amplifier,A-Doherty amplifier has four implementation methods in order to verify A-Doherty amplifier's actual performance,I take four A-Doherty amplifier in combination of two forms,a new implementation of A-Doherty amplifier,in accordance with the requirements of the following indicators to design and processing of the block out certain types of reactive Fang SBC,through repeated testing,optimization,so that to achieve optimal performance with traditional symmetrical Doherty amplifier(as opposed to A-Doherty amplifier in terms of) be compared.Practice has proved that A-Doherty amplifier can be achieved the desired objective,with obviously superior to the traditional symmetrical Doherty amplifier performance.At the whole issue of the implementation process,the author's main job there is:1.Pointed out that the traditional symmetrical Doherty amplifier existence less than two points.2.A-Doherty amplifier made of a new form of implementation.3.The indicator device in accordance with the selection and design A-Doherty amplifier.4.Of A-Doherty amplifier for ADS simulation,in theory,be validated.5.Design processing A-Doherty amplifier veneer and debugging,testing its performance.6.Put A-Doherty amplifier PCB measurement results with the traditional symmetrical Doherty amplifier PCB measurement results,as well as A-Doherty amplifier separately to compare simulation results and measured results,as well as the results of the comparison analysis. |
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