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  <xsd:element abstract="true" id="cdns_InterestPaymentOptionAxis" name="InterestPaymentOptionAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cdns_InterestPaymentOptionDomain" name="InterestPaymentOptionDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cdns_JasperMember" name="JasperMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cdns_LiabilitiesIncludedInLevelThreeRepresentingFairValueOfContingentConsiderationAssociatedWithAcquisitionsAbstract" name="LiabilitiesIncludedInLevelThreeRepresentingFairValueOfContingentConsiderationAssociatedWithAcquisitionsAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="cdns_LineOfCreditFacilityAdditionalBorrowingCapacityAvailable" name="LineOfCreditFacilityAdditionalBorrowingCapacityAvailable" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="cdns_LineOfCreditFacilityInterestLiborAndSpreadMember" name="LineOfCreditFacilityInterestLiborAndSpreadMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cdns_MarketableDebtSecuritiesMember" name="MarketableDebtSecuritiesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cdns_MarketableEquitySecuritiesMember" name="MarketableEquitySecuritiesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cdns_MaturityOfMarketableDebtInvestmentsAbstract" name="MaturityOfMarketableDebtInvestmentsAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="cdns_MaximumClosingPriceOfCommonStockToMakeWholePremiumInFormOfIncreaseToConversionRate" name="MaximumClosingPriceOfCommonStockToMakeWholePremiumInFormOfIncreaseToConversionRate" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="duration" />
  <xsd:element id="cdns_MinimumClosingPriceOfCommonStockForSpecifiedDaysForConversionOfNotes" name="MinimumClosingPriceOfCommonStockForSpecifiedDaysForConversionOfNotes" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="duration" />
  <xsd:element id="cdns_MinimumClosingPriceOfCommonStockToMakeWholePremiumInFormOfIncreaseToConversionRate" name="MinimumClosingPriceOfCommonStockToMakeWholePremiumInFormOfIncreaseToConversionRate" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="duration" />
  <xsd:element id="cdns_MinimumNumberOfTradingDaysLimitForWhichClosingPriceExceedsFixedPriceForConversionOfNotes" name="MinimumNumberOfTradingDaysLimitForWhichClosingPriceExceedsFixedPriceForConversionOfNotes" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="cdns_NumberOfCustomerWithLargestBalanceOfReceivable" name="NumberOfCustomerWithLargestBalanceOfReceivable" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="cdns_NumberOfCustomersWithAccountsReceivableAndInstallmentContractReceivableBalanceGreaterThanTenPercentOfBalance" name="NumberOfCustomersWithAccountsReceivableAndInstallmentContractReceivableBalanceGreaterThanTenPercentOfBalance" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="cdns_NumberOfFinalTradingDaysRangeWithInWhichClosingPriceExceedsFixedPriceForConversionOfNotes" name="NumberOfFinalTradingDaysRangeWithInWhichClosingPriceExceedsFixedPriceForConversionOfNotes" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cdns_OtherAmericaMember" name="OtherAmericaMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cdns_OtherIncomeExpense" name="OtherIncomeExpense" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cdns_OtherLongTermLiabilitiesMember" name="OtherLongTermLiabilitiesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cdns_PaymentOfAcquisitionRelatedContingentConsideration" name="PaymentOfAcquisitionRelatedContingentConsideration" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="cdns_PaymentofAcquisitionRelatedContingentConsiderationClassifiedAsFinancingActivity" name="PaymentofAcquisitionRelatedContingentConsiderationClassifiedAsFinancingActivity" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="cdns_PercentageOfCompanysReceivablesNetAndInstallmentContractReceivablesNetAttributableToSingleCustomer" name="PercentageOfCompanysReceivablesNetAndInstallmentContractReceivablesNetAttributableToSingleCustomer" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="cdns_PercentageOfCompanysReceivablesNetAndInstallmentContractReceivablesNetAttributableToTenCustomersWithLargestBalance" name="PercentageOfCompanysReceivablesNetAndInstallmentContractReceivablesNetAttributableToTenCustomersWithLargestBalance" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="cdns_Periodoverwhichcontingentconsiderationmaybepaid" name="Periodoverwhichcontingentconsiderationmaybepaid" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cdns_PotentialSharesOfCompanyCommonStockExcludedAbstract" name="PotentialSharesOfCompanyCommonStockExcludedAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="cdns_PrincipalAmountOustandingOfRevolvingLineOfCredit" name="PrincipalAmountOustandingOfRevolvingLineOfCredit" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="cdns_PrincipalPaymentsOnReceivableSaleFinancing" name="PrincipalPaymentsOnReceivableSaleFinancing" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cdns_ProductAndMaintenanceRevenue" name="ProductAndMaintenanceRevenue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="cdns_RecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedNet" name="RecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedNet" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cdns_RemainingPrincipalAmountOfDebtOutstanding" name="RemainingPrincipalAmountOfDebtOutstanding" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="cdns_RemainingPrincipalAmountOfLiabilityComponentOfConvertibleDebt" name="RemainingPrincipalAmountOfLiabilityComponentOfConvertibleDebt" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="cdns_RestructuringActivitiesNonCashChargesAdjustments" name="RestructuringActivitiesNonCashChargesAdjustments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cdns_RestructuringimpairmentofpropertyplantandequipmentMember" name="RestructuringimpairmentofpropertyplantandequipmentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cdns_ScheduleOfAmortizeCostGrossUnrealizedGainsLossesAndFairValueOfMarketableSecuritiesAbstract" name="ScheduleOfAmortizeCostGrossUnrealizedGainsLossesAndFairValueOfMarketableSecuritiesAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="cdns_ScheduleOfAmortizeCostGrossUnrealizedGainsLossesAndFairValueOfMarketableSecuritiesTableTextBlock" name="ScheduleOfAmortizeCostGrossUnrealizedGainsLossesAndFairValueOfMarketableSecuritiesTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="cdns_SeniorNoteWarrantsExpirationDateDescription" name="SeniorNoteWarrantsExpirationDateDescription" nillable="true" substitutionGroup="xbrli:item" type="us-types:dateStringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cdns_SeniorNotesDueTwentyTwentyFourMember" name="SeniorNotesDueTwentyTwentyFourMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cdns_SharesOfCommonStockThatCanBePurchasedUnderWarrants" name="SharesOfCommonStockThatCanBePurchasedUnderWarrants" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="cdns_StockOptionsAssumedForAcquisition" name="StockOptionsAssumedForAcquisition" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cdns_StockReceivedForPaymentOfEmployeeTaxesOnVestingOfRestrictedStock" name="StockReceivedForPaymentOfEmployeeTaxesOnVestingOfRestrictedStock" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cdns_TaxEffectRelatedToEmployeeStockTransactionsAllocatedToEquityFinancingActivities" name="TaxEffectRelatedToEmployeeStockTransactionsAllocatedToEquityFinancingActivities" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cdns_TermOfLineOfCreditAgreement" name="TermOfLineOfCreditAgreement" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="cdns_TradenameTrademarkAndPatentsMember" name="TradenameTrademarkAndPatentsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="cdns_Treasurystockrepurchaseapproved" name="Treasurystockrepurchaseapproved" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cdns_UnamortizedDebtDiscountExpenseIfConvertibleNotesConverted" name="UnamortizedDebtDiscountExpenseIfConvertibleNotesConverted" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cdns_UnamortizedTransactionFeesExpenseIfConvertibleNotesConverted" name="UnamortizedTransactionFeesExpenseIfConvertibleNotesConverted" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="cdns_WarrantsToPurchaseSharesOfCommonStockPricePerShare" name="WarrantsToPurchaseSharesOfCommonStockPricePerShare" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="duration" />
</xsd:schema>


