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1、实用标准文案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：文档实用标准文案IntroductionofdigitalfrequencymeterDigitalFrequencyisanindispensableinstrumentofcommunicationsequ
2、ipment,audioandvideo,andotherareasofscientificresearchandproduction.Inadditiontotheplasticpartofthemeasuredsignal,anddigitalkeyforapartoftheshow,allthedigitalfrequencyusingVerilogHDLdesignedandimplementedachieveinanFPGAchip.Theentiresystemisverylean,fl
3、exibleandhaveamodificationofthescene.1、AndotherprecisionmeasuringfrequencyPrincipleFrequencymeasurementmethodscanbedividedintotwokinds:(1)directmeasurementmethod,thatis,atacertaintimemeasurementgatemeasuredpulsesignalnumber.(2)indirectmeasurements,such
4、asthecyclefrequencymeasurement,VFconversionlaw.FrequencyMeasurementindirectmeasurementmethodappliesonlytolow-frequencysignals.Basedontheprinciplesoftraditionalfrequencymeasurementofthefrequencyofmeasurementaccuracywillbemeasuredwiththedeclineinsignalfr
5、equencydecreasesinthemorepracticallimitations,suchastheaccuracyandfrequencyofmeasurementnotonlyhashighaccuracy,butalsointhewholefrequencyregiontomaintainconstanttestaccuracy.ThemainmethodofmeasurementfrequencymeasurementPreferencesgatedsignalGATEissued
6、bytheMCU,GATEtimewidthonthefrequencymeasurementaccuracyoflessimpact,inthelargercontextofchoice,aslongastheFPGAin32of100inthecounterbMSignalsarenotoverflowline,inaccordancewiththetheoreticalcalculationGATEtimecanbegreaterthanthewidthTc42.94s,butduetothe
7、single-chipmicrocomputerdataprocessingcapacityconstraints,theactualwidthoflesstime,generallyintherangeofbetween0.1schoice,thatis,high-frequency,shortergate;,lowgatelonger.ThistimegatewidthTcbasedonthesizeofthemeasuredfrequencyautomaticallyadjustfrequen
8、cymeasurementinordertoachievetheautomaticconversionrange,andexpandedtherangeoffrequencymeasurement;realizationoftheentirescopeof文档实用标准文案measurementaccuracy,reducethelow-frequencymeasurementerror.Thedesignofthemainmethodsofmeasuringthefr
