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EfficientDeterminationofFeedbackDACErrors forDigitalCorrectionin ∆ΣA/Dconverters



converteraredeterminedbymeasuringtheidlechanneloutput and removing the DAC elements one by one. This method requires simple computation, does not add excess loop delay, andrequiresnoreconfigurationofthe ∆Σmodulator.Theerrors sodeterminedcanbeusedtocorrecttheoutputcodesinthe digitaldomainortheDACelementsintheanalogdomain.This techniqueisausefulalternativetothepopulardynamicelement matching at high speeds as excess delay cannot be tolerated andatlowoversamplingratioswhereDEMcanresultintones. Simulation results indicate that the correction values can be obtainedtoanaccuracythatissufficienttoreducenoiseand distortiontonearlyideallevels. I

Year: 2010
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