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时间: 2020-1-13 16:08
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ADSPControlledAdaptiveFeedforwardAmplifierLinearizerADSPControlledAdaptiveFeedforwardAmplifierLinearizerStephenJ.GrantJamesK.CaversSchoolofEngineeringScience,SimonFraserUniversityPaulA.GoudDept.ofElectricalEngineering,UniversityofAlbertaAbstract―Currently,theonlyavailablewideband(multipleMHz)amplifierlinearizationmethodisfeedforward.Feedforward,though,requiresautomaticadaptationofkeyparametersforreliabledistortioncancellationasoperatingconditionsvary.WithanovelandappropriateuseofDSP,wehaveimplementedafeedforwardlinearizerwithadaptationdrivenbyeasilycomputedgradientsignals.Thisovercomesthedifficulties,suchasDCoffsetsattheoutputofanalogmixersandmaskingofweaksignalsbystrongerones,thatslowand/orcauseincorrectconvergenceofmanypreviously……