| With the implementation of the policies of the Ministry of Industry and Information Technology to accelerate the development of 5G technology,the millimeter wave band has gradually entered people’s vision.Under this trend of The Times,the receiver that can work in 5G millimeter wave band has also become the research object of many enterprises and scholars.At the same time,this new type of receiver is also given higher requirements,such as wider frequency band,higher integration,lower power consumption and so on.Based on the micro-assembly process,an ultra-wideband and miniaturized millimeter wave receiving front-end is designed,and MMIC chips and microstrip passive device to complete the physical assembly of the front-end receiving components are used.The main work of this thesis is as follows:First of all,after fully investigating the development prospects of UWB receivers at home and abroad and the advantages and disadvantages of several existing receiver design schemes,a superheterodyne receiver to down-convert the high frequency millimeter wave is introduced.The superheterodyne receiver uses the mixing method of the received signal and the 24 GHz dot frequency local oscillator signal,with the signal frequency band moved from 30-40 GHz to 6-16 GHz,and a SDLVA chip is used to convert the output RF signal into video signal.Secondly,according to the size requirements of the front-end receiving components,the processing requirements of cooperative enterprises and the frequency band of the transmission signal,the required microstrip filter and microstrip equalizer are designed by myself,and the software HFSS is used to simulate and record the S-parameter result diagram.Then,by combining the basic ideas and technical requirements of the superheterodyne receiver,the basic block diagram is drawn,and according to the device inventory that can be called for the system needs low noise amplifier,switch,mixer,CNC attenuator,equalizer and other devices to select the appropriate model,and then the software ADS is used to complete the system link simulation and budget.In addition,in order to achieve the target requirement of adjustable sensitivity,the numerical control attenuator is used and TTL level is introduced through the dip dial to realize the sensitivity control of the front component of the receiver.Finally,the connection between the microstrip line and the active MMIC chip and the passive microstrip device is realized by a microassembly process,and the receiving front end is tested.The test results meet the design requirements: small signal gain between 36-40 dB,noise coefficient is less than or equal to 7dB,standing wave is less than or equal to 2.5,output signal stray is less than or equal to-25 dBc in the linear dynamic range,harmonics is less than or equal to-13 dBc,1dB compression point is greater than or equal to 13 dBm. |
