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基于AD7634的多道脉冲幅度分析器设计.docx

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基于AD7634的多道脉冲幅度分析器设计 Abstract AmultichannelpulseamplitudeanalyzerbasedonAD7634isdesignedinthispaper.Thesystemconsistsofananalogfront-endsignalconditioningcircuit,AD7634ADCmodule,FPGAprocessingmodule,andaPCfordataacquisitionandanalysis.Thereal-timeacquisitionandprocessingofpulsesignalsisrealizedbytheFPGA.Theperformanceofthesystemisevaluatedbymeasuringthetimeresolutionandtheenergyresolutionusinga^137Csgammasource.Experimentalresultsshowthatthesystemhasgoodtimeresolutionandenergyresolution,indicatingitspotentialapplicationinradiationmeasurementandnuclearphysicsexperiments. Introduction Pulseamplitudeanalysisisanimportanttechniquewidelyusedinnuclearphysicsexperiments,radiationmonitoring,andmedicalimaging.Itcanextracttheinformationoftheradiationenergyfromthepulseamplitude,whichisvitalfordeterminingtheenergyspectrumoftheradiationsourceandidentifyingtheradioisotope.Withthedevelopmentofmodernelectronicsandcomputertechnologies,thepulseamplitudeanalysissystemhasbeenimprovedandintegratedwithhardwareandsoftwaretoachievehigh-performance,accuracy,andreliability. Inthispaper,wepresentamultichannelpulseamplitudeanalyzerbasedontheAD7634ADCmodule.Thesystemisdesignedtoacquireandprocesspulsesignalsinreal-timewithhightimeresolutionandenergyresolution.TheAD7634isa18-bit,15MSPSsimultaneous-samplingADCwithalownoisefigureandhighcommon-moderejectionratio,makingitsuitableforhigh-precisionpulseamplitudemeasurement.TheFPGAisusedastheprocessingmoduletohandlethereal-timesignalprocessingandtriggerlogic.ThePCisusedtocontrolthesystemthroughtheUSBinterfaceanddisplaytheresults. SystemDesign ThesystemarchitectureisshowninFig.1.Itconsistsoffourmaincomponents:theanalogfront-endcircuit,theAD7634ADCmodule,theFPGAprocessingmodule,andaPCterminalfordataacquisitionandanalysis. Theanalogfront-endsignalconditioningcircuitisusedtoamplifyandfiltertheinputpulsesignal.Theinputsignalisattenuatedbyavariablegainamplifier(VGA)toallowtheadjustmentofthegainfordifferentenergyranges.Ahigh-passfilterisusedtoremovethebaseline