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分立元件设计的低噪声前置放大器实用电路第28卷第4期2005年12月电子器件ChineseJournalofElectronDevicesVol128No.4Dec.2005AppliedCircuitofLower-NoisePreamplifierComposedbyUnattachedComponentsGUOYu,LUYong2kang,CHENBo(InstituteofGeophysics&Geomatics,ChinaUniversityofGeosciences,Wuhan430074,China)Abstract:Accordingtoseries2woundamplifiersandnoisetheory,anappliedcircuitoflow2noise.Theresultshowsthatthecircuithaslowernoisepreamplifierisdesignedusingunattachedcomponentsvoltagethanthelow2noiseoperationalamplifiersexistedinthepresentmarket.preamplifierforthesignalgeneratorwithlowinnetresistance.Keywords:transistor;noiseanalysis;p……