,,(101710025):A/D,。LM311、/LF398,、、、,,。:,,,,1%。:;;LM311;LF398:TN78:A1674-6236(2012)11-0154-03Designofapeakholdcircuitforhigh-speedpulseWUNing,LIZheng-sheng,ZHANGMin(101StaffRoom,TheSecondArtilleryEngineeringUniversity,Xi’an710025,China)Abstract:TomeettherequirementoftheA/Dconversionofmulti-channelpulseamplitudeanalyzer(MCA)inthespectrummeasurementapeakholdcircuitsuitableforhigh-speedpulseisdesigned.Itincludeshigh-speedvoltagecomparatorLM311andSample/HoldchipLF398,withthefunctionsofamplitudediscrimination,waveformsampling,peakholdandchargingetc.Ithassimplestructureandiseasytodebug.Experimentshowsthatforhigh-speedsignals,thecircuitcanidentifypeakandkeepit,theerrorislessthan1%,whichhastheadvantagesofreliableperformanceandfastresponse.Keywords:high-speedpulse;peakholdcircuit;LM311;LF398:2012-03-23:201203174:(1987—),,,。:。,,,[1],A/D。,。,[2]。,100kHz,,,A/D。A/D,,。12。,;,[3-5]。,A/D,1/2LSB。Vi=Vmsinωt,VidVidt=Vm·ω(1)A/Dn,tc,A/D,ΔVi|Δt=tC=VmωtC≤12(Vm2n-1)(2)fmax=12n+1·π·tC(3)8A/Dtc=100μs,,A/Dfmax=6Hz。,A/D。1,,。2,1,2K1。,,ElectronicDesignEngineering20Vol.2011No.1120126May.20121Fig.1Schematicdiagramoftraditionalpeakholdcircuit-154-。,,,。,、,,。,。,,[6-8],,、。。23,、、、,LM311,、。LM311,U1,U2“”;NationalSemiconductorLF398/,TTL、CMOS,LOGIC/。MAX4541,C3、C4。Vi,U1、U2,“”U5LOGIC,U5,OUT1Vi。,OUT1Vi,U3,DU4,A/D,U7,。,U1、U2、U5,OUT1Vi,U3,,DU4,/Q,U6,OUT1,A/D;Q,,,A/D。A/D,D,U7,C3,C4,。2Fig.2Workwaveform3Fig.3Schematicdiagramofpeakholdcircuit33.1。、、、。,,。:1μs10V100mV,0.8%,1%,C3、C4。4[9]。,,-155-《》2012115Fig.5Waveformofpeakholdcircuit;,。,C3、C40.01μF。3.2,,。,(12V1V),。LF398:LF398,。(LOGIC)1pF,0.01μF,0V5V,LF398,1mV,。:;,。4,F051V、100kHz,TDO1000,5,1,2。,,。1%,A/D。5LM311,/LF398,、、。,、、,,1%,,,。:[1].[M].:,2004.[2].[M].:,1989.[3].[M].:,1985.[4],,.[J].,2009:363-366.LIQiang,LIUShi-xing,NIEBen-ming.Researchonapeakholdinganddataacquisitioncircuitfornuclearpulse[J].ElectronicMeasurementandInstrumentJournal,2009:363-366.[5]KhoiniPR,LimLB,JohnsD.Time-interleavedoversamplingA/Dconverterstheoryandpractice[J].IEEETransactionCircuitsandSystem,1997,44(8):65-71.[6]BuckensPF,VeatchMS.Ahighperformancepeakdetect&holdcircuitforpulseheightanalysis[J].IEEETransNuclearScience,1992,39(4):753-757.[7],,,.[J].,2009,29(1):42-45.HUXian-long,WENGDong-shan,FENGQi,etal.Apeakholdcircuitfornarrowpulse[J].NuclearElectronics&DetectionTechnology,2009,29(1):42-45.[8],,.[J].,2010,30(10):1323-1324.LIMei,ZHAOBao-sheng,ZHUXiang-ping.Asimplepulsepeakholdcircuit[J].NuclearElectronics&DetectionTechnology,2010,30(10):1323-1324.[9]NationalSemiconductor.LF398DataSheet[M].NationalSemiconductor,2006.4Fig.4Curverelationshipbetweenacquisitiontimeandholdcapacitorvalue-156-