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1、ECGacquisitionsysteminanalogcircuitdesignECGastheheartelectricalactivityintheperformanceofbodysurface,thesignalisweak,thespectralrangeof0.05~200Hz,voltageamplitudeis0~5mV[1],thesignalsourceimpedanceofthousandstohundredsofthousandsofEuropeEuropeandtherewerealotofnoise,sotheE
2、CGacquisitionsystemcanbetherationaldesignoftherightofthekeycomponentsofECG.ECGmeasurementconditionsisquitecomplex,inadditiontosubject,includingelectromyography,respiratorywavesignal,EEGsignalinterferenceandotheroutsideinterferenceinvivohasalsobeen50HZelectricity,baselinedri
3、ft,electrodecontactandinterferencewithotherelectromagneticdevicesinvitroTherefore,thestrongnoiseinterferencehowtoeffectivelysuppressavarietyofECGacquisitionsystemwillbethekeytothedesign.1ECGacquisitionsystemCompleteECGacquisitionsystemincludesanaloganddigitaltwoparts[2],whi
4、chsimulatesomeofthemajortocompletethepickupECGsignals,amplificationandfiltering,theanalogportionofthedigitalpartwillreceivetheECGsignalanalysisandprocessingtohealthcarepersonnelarriveatacorrectdiagnosis,theECGacquisitionsystemintheanalogcircuitsintheECGmonitoringsystemplays
5、animportantrole.ECGacquisitionsystemstructureshowninFigure1.Figure1.TheoverallstructureofECGacquisitionsystemECGacquisitioncircuitsimulationADconversionLevelofupliftEnlargeFiltercircuitPreamplifierECGCarriedonbythespecialelectrodesinthehumanECGsignalpickupthefirstamplifiedb
6、ytheinitialpre-amplifier,andavarietyofinterferencesignalsinacertaininhibitionintotheband-passfiltertofiltertheECGsignalinterferenceoutsidethefrequencyrange,andthenfilteredbythemainamplifierwillamplifythesignalfurthertotherightrange,andthenfilteredby50Hznotchfilterfrequencyi
7、nterference,aresimulatedECGsignalwillbeconvertedintotheADsystem,analog-digitalconversion,convertedintodigitalsignalsAfterthecentralprocessingunitresponsibleforthesubsequentanalysisandprocessing.2preamplifiercircuitPickedupfromthebodysurfaceECGgenerallyonlyafewmillivolts,ino
8、rdertoimproveitsresolutiondisplayandprocessinginthebackend,youfirstneedtoamplifyth
