毕业设计——低频数字相位测量仪

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1、摘要低频数字相位测量仪摘要设计了一个基于现场可编程门阵列（FPGA）和AT89S51单片机相结合的低频数字相位测量仪。本系统可分为三大基本组成部分：数据测量电路、数据运算控制电路和数据显示电路。FPGA数据测量电路的功能就是实现将待测正弦信号的周期、相位差转变为19位的数字量。单片机数据运算控制电路的功能就是负责读取FPGA测量到的数据，并根据这些数据计算待测正弦信号的频率及两路同频正弦信号之间的相位差，同时通过功能键切换，显示出待测信号的频率和相位差。数据显示电路的设计采用静态显示方式，显示电路由8片1位串入8位并出的74LS

2、164芯片组成。本系统拟用FPGA和单片机相结合，构成整个系统的测控主体。整个系统发挥了FPGA和单片机各自的优势，具有高速而可靠的测控能力，具有比较强的数据处理能力，键盘输入及显示控制比较灵活，系统可扩展性比较好，整个系统性能价格比比较好。关键词FPGA，单片机，频率，相位差，相位测量仪I攀枝花学院本科毕业设计（论文）ABSTRACTABSTRACTThepaperhasdesignedalowfrequencydigitalphasemeasuringinstrumentbasedonthesystemwhichcommun

3、icatesFPGAandthemicrocontroller(AT89S51).Thissystemincludesthreemodules:datameasuringelectriccircuit,dataoperationcontrolcircuitanddatadisplayelectriccircuit.ThefunctionoftheFPGAdatameasuringelectriccircuitistransformsthecycle,phasedifferenceofthetwoinputsinesignalst

4、obe19bitofdigitaldata.ThefunctionaboutmicrocontrollerdataoperationcontrolcircuitistoreadthedatawhichFPGAhasmeasured,andaccordingtothesedatacomputationsthefrequencyandthephasedifferencebetweentwogroupsinesignalswhichhavesamefrequencies,simultaneouslythroughthefunction

5、keyswitch,displayingthefrequencyandphasedifferenceofthetwogroupsinesignals.Thedatadisplayelectriccircuit’sdesignadoptingthestaticstatedisplaymode,thedisplaycircuitiscomposedby8piecesof74LS164chip(8-bitSerial-Input/Parallel-OutputshiftRegister).ThissystemplanswithFPGA

6、andthemicrocontroller,framingthephasemeasuringinstrument’sdominantmeasurementandcontrolsystem.TheoverallsystemhasdisplayedFPGAandthemicrocontrollerrespectivesuperiority,hashighspeedandthereliablemeasurementandcontrolability,andhasthequitestrongcapacityofdealwithdata,

7、thekeyboardentryandthedisplaycontrolalsoquiteflexible.Thesystem’sextensionisquitegood.Allthesuperioritiesmakethegoodperformancepriceratioofthislowfrequencydigitalphasemeasuringinstrument.KeywordsFPGA,Microcontroller,Frequency,Phasedifference,PhasemeasurementsystemII目

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