Reserch And Design Of Radio Frequency Front-end For 2.4GHz Wireless Transmitter

With the rapid development of wireless communications, the radio frequency (RF) front-end is increasingly becoming a bottleneck to enhance the performance for the transmitter. As a key part of wireless transceiver, it has become a hot spot of research at home and abroad. In this thesis, the research and design for RF front-end of wireless transmitter on the 2.4GHz ISM band has been discussed under the actual project requirements.In this thesis, it is difficult to implement impedance match and fulfill the high dynamic range requirement because RF front-end is about to process analog signals with huge dynamic range. After summarizing advanced experience of RF front-end design, a 2.4GHz RF front-end is designed and realized based on the actual parameter of system. In this thesis, a new structure of cascade uneven power divider is proposed, and with this kind of power divider, the performance of power amplifier is enhanced. The main contents of this thesis are as follows:First, general structures of various transmitters are comprehensively analyzed, and advantages and disadvantages of each structure are figured out. The structure of 2.4GHz RF front-end for wireless communication system is chosen and parameters of transmitter is determined by actual project requirements.Second,comprehensive theoretical analysis for each model of transmitter is taken, and simulation for each model of transmitter is implemented in Advanced Design System 2005 design kit, which include RF filter, up-converting mixer, power divider and power amplifier. Then, the simulating circuits and parameters are repeatedly optimized to meet the design indicators according to system requirement. Based on simulating and analyzing results, the hardware system is implemented, and the performance and parameters are tested and analyzed. Results meet the requirements of project, and the feasibility of design for each model is verified.Finally, Deviation of each model has been analyzed which based on the result of testing, improvement measure and later outlook is proposed.