简介:TheRFsystemforTESLArequiresacomprehensiveinterlocksystem.Usuallyinterlocksystemsareorganizedinahierarchicalway,Inordertoreacttodifferentfaultconditionsinafastandflexiblemanneranonhierarchicalorganizationseemstobethebettersolution,AttheTESLATestFacility(TTF)atDESYwewillinstallanonhierarchicalinterlocksystemthatisbasedonuserdesgnedreprogrammablegate-arrays(FPGA's)whichincorporateanembeddedmicrocontrollersystem.ThissystemcouldbeusedlaterfortheTESLAlinearcolliderreplacingastrictlyhierarchicaldesign.
简介:IMPCSRRFGroupcooperatingwithBINPhasfulfilledthefollowingprojects.PCIbasedRFsignalgenerator;PLDcenteredRFstationinterlockandsurveillanceunit;Highfrequencyanalogsignalprocessingunits;CVIandWindowsplatformbasedmonitorandoperationinterface.
简介:RFpoweramplifiers(PAs)areusuallyconsideredasmemorylessdevicesinmostexistingpredistortiontechniques.Nevertheless,inwidebandcommunicationsystems,PAmemoryeffectscannolongerbeignoredandmemorylesspredistortioncannotlinearizePAseffectively.AfteranalyzingPAmemoryeffects,anovelpredistortionmethodbasedonwaveletnetworks(WNs)isproposedtolinearizewidebandRFpoweramplifiers.Acomplexwaveletnetworkwithtappeddelaylinesisappliedtoconstructthepredistorterandthenacomplexbackpropagationalgorithmisdevelopedtotrainthepredistorterparameters.Thesimulationresultsshowthatcomparedwiththepreviouslypublishedfeed-forwardneuralnetworkpredistortionmethod,theproposedmethodprovidesfasterconvergencerateandbetterperformanceinreducingout-of-bandspectralregrowth.