搜索
：82-946360/《PLC200》Thedesignofpreamplifiercircuitbasedonweaksignaldetection(1.;2.)1,2212ZHANGShi-ruiZHENGWen-gangHUANGDan-fengZHAOChun-jiang:,,。,。PGA202,,。:;;;:TN721.5:AAbstract:Combinedwiththedemandofthedetectionofweaksignalinprecisionagriculture,thearticleintroducedthecircuitprinci-pleofdeigningpreamplifiercircuitwhitI/VConversionlevel,instrumentationamplifierlevelandlow-passfilterlevel.Atthesametimethearticlediscussedthecircuit'snoisesuppressionandisolationaccordingtothecharacteristicsoftheweaksignal,andgavethemethodofchoosingelementsandnoisereduction.Finally,gavethedesignoftheweaksignaldetectionpre-amplifierusingtheprogram-controlledintegratedinstrumentationamplifierPGA202.Keywords:precisionagriculture;weaksignaldetection;instrumentationamplifier;preamplifier:1008-0570(2009)08-2-0223-021,、、,、,,。。、,,,。,、。,,。,,。2,,。,,,,。1。1,,。,,,。,,。2。,,R2,R2,,。2::;:(D0706007040191);“”;:(2006BAD10A04);“”;:(2006BAD11B05)223--《》(SOC)2009258-2360/：82-946《200》3,,,,、,。3.1,,。、,。,pA。,AD8571、LMC6482、LF351OPA2703。,,。,。,。,INA127,,,。PGA202,,PGA202,。2007ADIAD8253,,,。3.2,。,,。,50Hz,50Hz。,,。43PGA202,PGA202,。4.1PGA202PGA202BURR-BROWN,PGA202,。,PGA202,,。PGA2023。3,A0A1,PGA202,A0、A11、10、1001000。4.2,,。,,。,100kΩ,33nF,48Hz。4.3,、、,OPA2277。AD8571,AD857120-70pA,1uV,120-140dB,I/V。,,0.1uF。,,。4。4PGA2024.414,R01kΩ,。TFG230020H,500kΩ。A,。TDS1002。1A1、A011、10。1。(188) 500RRkAA ??224--《》(SOC)2009258-2360/：82-946《200》,,。(4),,、、。4,BP,CCD、。:DSP。,。,,。5,DSP,,、,。,。,。:,,,。[1].[M].,2005,3.[2],.DSP[J].,2008,6-2:197-201[3],.DSP[J].,2005,2:249-250[4],,.、[J].,2006,19:32-34.:,,,19843,,,,;,,,198311,,,。Biography:TONGXian-hui,Male,HanNationality,1984.03,JiangsuLianyungang,CollegeofInformationScienceandEngi-neeringgraduatestudent,NanjingUniversityofTechnologyNan-jing,ResearchdirectionforartificialneuralnetworksandRobotappliedtechnology.(210009)(CollegeofInformationScienceandEngineering,NanjingU-niversityofTechnologyNanjingJiangsu210009,China)TONGXian-huiSUNShuang：(2100095214)(:2009.07.05)(:2009.08.05)(224)5。,,、。PGA202,,。:,,PGA202。[1]“”[J]1999.31-8[2],[J]2008.5112-121[3],[J]2007.851-53[4],,,[J]2007.7168-171[5],,CMOS[J]200710-2236-238[6]PGA202/203[J]1999.1029-30[7],,,AD603[J]2007.1168-69[8]()[M]1999:(1985-)。Biography:ZHANGShi-rui(1985-),male,InnerMongolia,ShanghaiJiaoTongUniversity,Masterstudent.（200240）(100097）(SchoolofAgricultureandBiology,ShanghaiJiaoTongUni-versity,Shanghai,200240,China)ZHANGShi-ruiHUANGDan-feng(NationalEngineeringResearchCenterforInformationTech-nologyinAgriculture,Beijing,100097,China)ZHANGShi-ruiZHENGWen-gangZHAOChun-jiang：(100097)(:2009.07.05)(:2009.08.05)188--