Signal Processing at 250 MHz Using.pdf

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1、238IEEETRANSACTIONSONVERYLARGESCALEINTEGRATION(VLSI)SYSTEMS,VOL.6,NO.2,JUNE1998SignalProcessingat250MHzUsingHigh-PerformanceFPGA'sBrianVonHerzenAbstractÐThispaperdescribesanapplicationinhigh-perform-ofcomplexcomputations.Reconfiguringthecomputeronde-ancesignalprocessingusi

2、ngreconfigurablecomputingengines:mandprovidesauniqueflexibilitythathasnotexistedbefore.a250-MHzcrosscorrelatorforradioastronomy.Experimentalresultsindicatethatcomplementarymetal±oxide±semiconductor(CMOS)fieldprogrammablegatearrays(FPGA's)canper-II.CORRELATIONSPECTROMETERSfor

3、musefulcomputationat250MHz.ThenotionofanªeventhorizonºforFPGA'sleadstocleardesignconstraintsforhigh-Radioastronomersanalyzespectrausinghigh-performancespeedapplicationdevelopers,andcanbeappliedtoavarietyofreal-timecomputers[3].High-frequencyradioastronomy,real-timesignalp

4、rocessingalgorithms.Recentestimatesindicateparticularlymillimeter-waveandsubmillimeterastronomy,thathigherperformanceFPGA'savailableearlyin1998canutilizeswide-bandspectrometerswithatleast1±2GHzofattainspeedsofover300MHzusing20%fewerlogicelementsspectrometerbandwidth.Weaka

5、stronomicalsignalsrequirethancurrentdesigns.TheresultsofthisdesignworkprovideimportantcluesonhowtoimproveFPGAarchitecturesforsignalfull-parallelintegrationonallofthechannelstodetectmeasur-processingathundredsofMHz.Directroutingchannelsbetweenablesignals.Therefore,scanning

6、spectrometersdonotworklogicelementscansignificantlyincreaseperformance.Routingforthisapplication.Acoustoopticspectrometerscanachievearchitectureswithfour-waysymmetryallowforrotationsandthebroadbandwidth,butbecomeproblematicinlargearraysreflectionsofsubcircuitsneededforoptim

7、alpackingdensity.andforspace-borneapplicationswhereadjustmentsoftheExperimentalresultsindicatethatclockbufferingoftenlimitsthetopspeedoftheFPGA.Wavepipeliningofclockdistributionanalogelementsbecomeverydifficult.networkmayimproveFPGAperformance.Anotheralternativeusesaparall

8、eldigitalcorrelatorthatcomputestheautocorrelationfunctionoftheincomingbase-IndexTermsÐCorrelator