Research And Design In Rf Front-end Circuits Of 2.4GHz Telecommunication Receiver

In the last few years,the technology of RF electronic circuits has developed rapidly,which leads to the unbelievable success of GSM,WLAN,Bluetooth,GPS and RFID.Therefore,based on the analysis of the working principle of four kinds of common structure receivers,this paper studies the RF front-end components of superheterodyne receivers,and makes use of RF design software to analyze the feasibility of the components designed by theoretical research.The simulation results show that Designed components have very good performance.Firstly,this paper gives the analysis of four common receivers in their working principle and technique properties,then introduces about how to judge the performance of these receivers by main parameters and design the core components.Combining with the content,the research on RF front end circuits is based on super heterodyne receiver.Secondly,we select three core components in RF front end to simulate in an optimized way.Based on theory about parallel coupled microstrip lines,we calculate the characteristic impedance of odd and even modes in filters whose schematic diagram is put into simulation as well as the band-pass filter.Moreover,after studying the theory on low noise amplifier,we choose ATF54143 RF Transistor as the investigating subjects,the analysis of DC characteristics and its stability and the designation of biasing circuits,minimum noise inputting circuits and maximum gain outputting circuits are considered here,all of these circuits above result in the successful design of low noise amplifier.Later,this paper focuses on the optimization of the second component called single-balanced mixer,the simulating result shows the performance of 3dB quadrature coupling network in the mixer is excellent,luckily the performance of IF filter is also wonderful.At last,all these three core components are tested together in ADS,we draw the conclusion that these three core components designed in this paper meet the design requirements,and the performance of this system keeps the same with our expectation.