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1、武汉轻工大学毕业设计外文参考文献译文本2013届原文出处：fromVinSkahill.VHDLforProgrammableLogicpage76-88毕业设计题目：基于FPGA的数字频率计设计院（系）：电气与电子工程学院专业名称：电子信息科学与技术学生姓名：学生学号：指导教师：IntroductionofdigitalfrequencymeterDigitalFrequencyisanindispensableinstrumentofcommunicationsequipment,audioandvideo,a
2、ndotherareasofscientificresearchandproduction.Inadditiontotheplasticpartofthemeasuredsignal,anddigitalkeyforapartoftheshow,allthedigitalfrequencyusingVerilogHDLdesignedandimplementedachieveinanFPGAchip.Theentiresystemisverylean,flexibleandhaveamodificationofth
3、escene.1、AndotherprecisionmeasuringfrequencyPrincipleFrequencymeasurementmethodscanbedividedintotwokinds:(1)directmeasurementmethod,thatis,atacertaintimemeasurementgatemeasuredpulsesignalnumber.(2)indirectmeasurements,suchasthecyclefrequencymeasurement,VFconve
4、rsionlaw.FrequencyMeasurementindirectmeasurementmethodappliesonlytolow-frequencysignals.Basedontheprinciplesoftraditionalfrequencymeasurementofthefrequencyofmeasurementaccuracywillbemeasuredwiththedeclineinsignalfrequencydecreasesinthemorepracticallimitations,
5、suchastheaccuracyandfrequencyofmeasurementnotonlyhashighaccuracy,butalsointhewholefrequencyregiontomaintainconstanttestaccuracy.ThemainmethodofmeasurementfrequencymeasurementPreferencesgatedsignalGATEissuedbytheMCU,GATEtimewidthonthefrequencymeasurementaccurac
6、yoflessimpact,inthelargercontextofchoice,aslongastheFPGAin32of100inthecounterbMSignalsarenotoverflowline,inaccordancewiththetheoreticalcalculationGATEtimecanbegreaterthanthewidthTc42.94s,butduetothesingle-chipmicrocomputerdataprocessingcapacityconstraints,thea
7、ctualwidthoflesstime,generallyintherangeofbetween0.1schoice,thatis,high-frequency,shortergate;,lowgatelonger.ThistimegatewidthTcbasedonthesizeofthemeasuredfrequencyautomaticallyadjustfrequencymeasurementinordertoachievetheautomaticconversionrange,andexpandedth
8、erangeoffrequencymeasurement;realizationoftheentirescopeofmeasurementaccuracy,reducethelow-frequencymeasurementerror.Thedesignofthemainmethodsofmeasuringthefrequencymeasurementandc
