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基于SOPC的DDS信号源的实现
SOPC-BasedImplementationofDDSSignalGenerator
DDS(DirectDigitalSynthesis)signalgeneratorisakeycomponentinmanyelectronicsystemssuchascommunication,instrumentation,andcontrolsystems.Itgenerateshighprecisionandstablesignalwaveformswiththehelpofadvanceddigitaltechnologies.TheSOPC(SystemonProgrammableChip)architectureisaneffectiveplatformtoimplementDDSsignalgeneratorsduetoitsflexibility,scalability,andreconfigurability.ThisarticleprovidesanoverviewoftheSOPC-basedimplementationofDDSsignalgenerators,includingitsbasicprinciples,designflow,andperformanceevaluation.
BasicPrinciplesofDDSSignalGenerator
TheDDSsignalgeneratorproducesperiodicwaveformsbydigitallysynthesizingasinusoidalwaveformwithaprogrammablephaseaccumulator.Thephaseaccumulatorisadigitalcounterthataccumulatesaphasevalueateachclockcycleaccordingtothedesiredoutputfrequencyandclockfrequency.Thephasevalueisthenconvertedtoanoutputwaveformbyasinelookuptable,oradigital-to-analogconverter(DAC),orboth.Thefrequencyoftheoutputwaveformisrelatedtothephaseincrementvalueandtheclockfrequencybytheformula:
f_out=f_clk×phase_inc/2^n
wheref_outistheoutputfrequency,f_clkistheclockfrequency,phase_incisthephaseincrementvalue,andnisthebit-widthofthephaseaccumulator.Thephaseincrementvaluecanbechangeddynamicallytoproducefrequencymodulation,amplitudemodulation,phasemodulation,orcomplexmodulation.
DesignFlowofSOPC-BasedDDSSignalGenerator
TheSOPC-basedDDSsignalgeneratorcanbeimplementedinvariousFPGA(FieldProgrammableGateArray)orCPLD(ComplexProgrammableLogicDevice)platformsusinghardwaredescriptionlanguages(HDL)suchasVHDL(VHSICHardwareDescriptionLanguage)orVerilog.Thedesignflowconsistsofthefollowingsteps:
Step1:ChoosetheFPGAorCPLDplatformthatmeetsthesystemrequirementssuchasperformance,capacity,I/Ointerface,cost,andpowerconsumption.
Step2:DefinethesystemarchitecturethatincludestheDDScoremodule,theclocksource,thememoryblock,theI/Ointerface,andotherperipheralmodulesifnecessary.TheDDScoremoduleshouldhavethephaseaccumulator,thesinelo