简介:赛灵思公司(Xilinx)日前,在北京举办了新闻发布会,宣布推出Spartan-3A系列I/O优化现场可编程门阵列(FPGA)平台。这一平台是对低成本、大规模应用的新一代Spartan-3系列产品的扩展。Spartan-3A平台为相对于逻辑密度而言更注重I/O数量与功能的应用提供了一个成本更低的解决方案。Spartan-3AFPGA支持业界最广泛的I/O标准(26种),具备独特的电源管理、配置功能以及防克隆(anti—cloning)安全优势,可以为消贽和工业领域中的新型大规模应用,如显示屏接口、视频/调谐器板接口和视频交换,提供灵活的、成本更低的解决方案。
简介:LinearPhaseFIRFilteronMeasuring3-DSurface①WANGYunshan,YANGFujun,LIWei(ShandongUniversityofTechnology,Jinan250061,CHN)Abstract...
简介:InthispaperthedesignandimplementationofMulti-Dimensional(MD)filter,particularly3-Dimensional(3D)filter,arepresented.Digital(discretedomain)filtersappliedtoimageandvideosignalprocessingusingthenovel3Dmultiratealgorithmsforefficientimplementationofmovingobjectextractionareengineeredwithanexample.Themultirate(decimationand/orinterpolation)signalprocessingalgorithmscanachievesignificantsavingsincomputationandmemoryusage.Theproposedalgorithmusesthemappingrelationsofz-transferfunctionsbetweennon-multirateandmultiratemathematicalexpressionsintermsoftime-varyingcoefficientinsteadoftraditionalpolyphasede-compositioncounterparts.ThemappingpropertiescanbereadilyusedtoefficientlyanalyzeandsynthesizeMDmultiratefilters.
简介:Anovelmethodfordesigningabeam-switchingantennawiththeplanedipoleispresented.Theantennaiscomposedofdoubledipolesplacedatthecenterofanactivesquarestructurethatisdividedinfourequalsectorsbymetallicsheets.Metallicpatchesattheoutsideofthestructureareusedtoenhancetheradiationperformanceoftheantenna.Ineachstep,thediodesinonesectorareon,whereasotherdiodesareoff.Thesectorwithoff-statediodesdefinesthedirectionoftheradiationpattern.AnantennamodelisdesignedonthesubstrateofFR4.Theproposedantennaoperatesfrom4.8GHzto5.5GHzwithgainof6.3dBiandF/B(fronttobackratio)of13.2dBiwhentheoperatingfrequencyis5.2GHz.Theantennaradiationpatterncanbesweptintheentireazimuthplaneinfourstepswitha3dBbeamwidthof90.Theresultsrevealthattheantennacouldbeusedinthebasestationofthewirelesscommunicationsystems.