基于MSP430的手持式LCR数字电桥的设计与实现

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1、北京交通大学硕士学位论文基于MSP430的手持式LCR数字电桥的设计与实现姓名：裴慧卿申请学位级别：硕士专业：计算机系统结构指导教师：高金山20080601ABSTRACTThispaperdesignsanewtypeofhandheldLCRmeterforelectronicme心删1∞ts·ThismetercallmeaSureresistanceR，capacitanceC，inductanceLandotherrelatedarguments．Thismeteriscomposedofsignalgeneratecircuit，half-bridgemeasurementcir

2、cuit，phase-sensitivedetectorcircuit,A／Dconverter,microprocessor，keyboardarray,LCDaIlds0on．IIlthedesignofstandardsignalgeneratorcircuit,aFPGA(FieldProgrammableGateArray)chipandfiltercircuitareusedtogetprecisefrequenciestorme删eInentsandfortheclockofA／Dconverter．Thehalf-bridgecircuithasfourstalldardre

3、Sistancesalldseveralhighprecisionoperationalamplifiers．ItcallchooseapPropilatestandardresistancesfordifferentmeasurementsforautorangesetup·lhlssystemalsohasthefunctionofamplifyingtheweaksignaltogettheprecises锄pledata．Thephase．sensitivedetectingcircuit，highprecisedualslopA／Dconverterand毹ecoordinatea

4、xistheorymakethesystemhavehighel"precision．ThemicroprocessorinthissystemisMSP430F449ofMSP430seriesproducedbyTexaLsIllstmmeIltsIncorporated．Thefunctionsofsystemarecontrolledbyakeyboardarray，a11dthearrayiscomposedof9keysbasedontheinterrupttechnologyofMSP430F449．Twomethodsofkeyscontrolareused．Thedatao

5、fmeasurementaledisplayedonLCD，andthemaindisplayhas5digits，thevicedisplayhas4digits·Ttlissvst锄hasmanyfunctions，whichareL／C／Rchoose，measurementfrequencieschoose，industryfrequencyinterferencechoose，datahold，flashdataaccess，voltagetest，beepandSOon．ThehardWaredesignandsoftwarearithmeticimplementationare

6、alsodescribedinthispaper．Erroranalysisisdonebasedonlargeamountoftestdata．ThismeterhaShigherprecision，10werconsumptionandsmallersize．Thebasicprecisionisabout0·5％·ThelimitsetuprangesarethatR：1mlOMQ；L：10uH～100mH；C：100pF～10uF，thebasicaccuracYofthemeterisO．5％，thepowersupplyis9Vandthe∞rrentcon吼姗ptjonis50

7、mA-qS0mA．29figures，14tables，25referenceliteraturesare1ncludedinthisPaper．KEYWORDS：LCRmeter；FPGA；MSP430；Embeddedsystem；Electronicmeasurement·CLASSNO：TP216学位论文版权使用授权书本学位论文作者完全了解北京交通大学有关保留、使用学位论文的规定。特授权北京交通大学可