一款2Gs采样率20 GHz带宽主从式跟踪保持电路设计研究(英文)-豆柴文库

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一款2Gs采样率20GHz带宽主从式跟踪保持电路设计研究(英文)
ResearchontheDesignofa2GsSamplingRate20GHzBandwidthMaster-SlaveTracking-HoldCircuit
Introduction
Withthecontinuousdevelopmentofelectronictechnology,therequirementforhigh-speedandhighsamplingratedataacquisitionandprocessinghasbecomeincreasinglyurgent.Itisnecessarytodesignapreciseandefficienttracking-holdcircuittomeetthisrequirement.Thispaperfocusesonthedesignandresearchofa2Gssamplingrateand20GHzbandwidthmaster-slavetracking-holdcircuit.
DesignPrinciple
Amaster-slavetracking-holdcircuitisdesignedbasedontheprincipleofsamplingandholding.Samplingreferstotheprocessofcapturingtheinputsignalwaveformatacertainmomentintime,andholdingreferstotheprocessofmaintainingthecapturedwaveformforacertainperiodoftime.Themaster-slavetracking-holdcircuitiscomposedofamastercircuitandaslavecircuit.Thetrackingfunctionisrealizedinthemastercircuit,andtheholdingfunctionisrealizedintheslavecircuit.Themastercircuitisresponsibleforsamplingandtrackingtheinputsignalwaveform,andtheslavecircuitisresponsibleforholdingandoutputtingthesampledwaveform.
DesignProcess
Thedesignprocessofthemaster-slavetracking-holdcircuitcanbedividedintothreestages:front-endtracking,samplingandholding,andoutputbuffer.
Front-endtracking:
Thefront-endtrackingcircuitisusedtotrackandamplifytheinputsignal.Themaincircuitconfigurationisanoperationalamplifier(Op-Amp)emitterfollowerwithafeedbackresistor.Theinputsignalisamplifiedbyanemitterfollower,andthefeedbackresistorisusedtoincreasetheinputimpedance.Atthemomentofsampling,theinputsignaliscontinuouslytrackedtominimizethetrackingerror.
Samplingandholding:
Thesamplingandholdingcircuitisusedtosampleandholdtheinputsignal.Thecircuitconfigurationisaswitchcircuit,anOp-Ampbufferwithahighinputimpedance,andacapacitor.Whenthesamplingswitchisturnedon,theinputsignalisconnectedtothecapacitorandchargedtothesamevoltageastheinputsignal.Whenthesamplingswitchisturnedoff,thesampledvoltageonthecapacitorisheldbytheOp-Ampbufferwithahighinputimpedance,preventingthevoltagefro