上官雨莜
TwoadjustableparametersFIRfiltersystemhardwaredesignThisdesignusingFPGAparallelarchitecture,computingspeedofthecharacteristicsandreliabilitycharacteristicsofhigh-speedUSB2.0interface,designedaFPGA+USB2.0+computerFIRdigitalfiltersystem,FPGA'sspeedandmachineflexibilityofComputerorganicallythroughtheUSB2.0bus,combinedblockdiagramshowninFigure3.Ontheonehand,thecomputerwillcalculatetheconfigurationparameterstransmittedtothenextthroughtheUSB2.0bus,FPGA,inordertoachievedifferentwindows,differentcut-offfrequencyoftheFIRfilter.Ontheotherhand,use10-bitA/Dconverterforsignalconversion,digitalsignalinputtotheFPGAdevice,intheFPGAdevicesforFIRfiltering,thefiltereddatathroughUSB2.0BusTransfertothemachineoperatormachine. 2,1A/DconvertermoduleA/Dconvertermodulemainfunctionistodigitizetheanalogsignal,andthenintotheFPGAindigitalsignalprocessing.A/DconvertermodulestructureshowninFigure4,thefirstanalogsignalsforsignalconditioning,andthenA/DconverterinFPGAwillbeunderthecontrolofsignalconditioningtoconvertdigitalsignals,powersupplymoduleforthechipprovides5Vand3.3Vpower.2.1.1SignalConditioningCircuitSystemusestheA/Dconversionchipanaloginputsignalpeak-peakvoltageof+2V,forsomeoftheoutputanalogsignalrangedoesnotcomplywiththeA/Dconversionchiprequirements,inordertoexpandtheapplicationofthesystem,andthereforeA/Dconversionbeforethesignalconditioning.Conditioningistheamplification,buffering,orcalibrationofanalogsignalstomakeitsuitableforanalog/digitalconverter(ADC)input.Thekeyistochoosetheop-amp.Thedesignofsignalconditioningcircuitfortwovoltage-followercircuits,usinglow-powervoltagefeedbackamplifierAD8052.SignalconditioningcircuitinFigure5.Theamplifierinputvoltagerange-0.2V~4V.8-pinvoltage,usingasingle+5Vpowersupplytoworkproperly.InputsignalfortheSignal,accordingtothediagramofthecircuitconnection,theoutputvoltagerangeofthesignalADSiginenablesA/Dconversionchipworkcorrectly.2.1.2A/DconversioncircuitA/Dconversioncircuitaccordingtopre-selectedsamplingperiod,theinputtothesystem'sanalogsignaliscollected.Takingintoaccounttheneedforsystemflexibilityandfutureupgrades,thedesignofA/Dconversionchiptousetouse10-bitaccuracy,samplingrateaslowas20kHz,upto40MHzoftheAD9203chip.AD9203isaAD'sbuyonesingle,low-voltagehigh-speedA/Dconversionchip.Itisstableandreliableaccuracyinthewholesamplewithinthebandwidth,andalwaysremaineda10-bitprecision;in40MHzsamplingrate,theeffectivenumberofbitsstilltoreach9.55,thedifferentialnon-linearityof±0.25LSB,SNRanddistortionremainataround59dB.AD9203operatingvoltagemoreflexible,allowingchangesinthecontextof2.7V~3.6V,especiallysuitableforportabledevicesatlowvoltage,high-speed
芳儿beauty
调谐滤波器Tuned filterfilter的意思、解释过去式：filtered; 过去分词：filtered; 现在分词：filtering; 复数形式：filters;n.1. 过滤, 过滤器2. 滤光器；滤声器；滤波器 3. 交通红灯指示不得直行的同时，表示可左转或右转的）分流指示灯4. (香烟头上的)过滤嘴；[口语]有过滤嘴的香烟vt. & vi.1. 透过, 过滤2. 缓行3. （光或声）渗入；透过4. （交通指示灯处的交通）仅可左转行驶vi.1. (消息等)走漏2. 漏过，滤过，透过3. 渗，渗入vt.1. 用过滤法除去(固体粒子或杂质等)，滤出，滤清(常与off或out连用)2. 起滤器作用adj.1. [口语]过滤嘴的
