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1、DongmeiLiElectronicEngineeringDept.,TsinghuaUniversityAdvancedAnalogIntegratedCircuitsCurrentMirrorCurrentSourcesòAssumethatIisthereferencecurrent,andIistheD1D2desiredcurrentsource.òIfλ≠0andifV≠VthentheremaybeasignificantXYerrorbetweenthetwocurrents.Fall,20061Dongme
2、iLiElectronicEngineeringDept.,TsinghuaUniversityAdvancedAnalogIntegratedCircuitsCurrentMirrorCurrentSources(cont.)òErrorin(a):(assumingthatbothtransistorshavethesameW/Lratio)òI-I=0.5k’(W/L)(V-V)2λ(V-V)D1D2nbTHXYòIn(b)itcanbeshownthatI-I≈0.5k’(W/L)(V-V)2λ(V-V)/[(g+g)
3、r]D1D2nbTHXYm3mb3o3òCascodingsignificantlyreducesthemismatchbetweenthetwomirroredcurrentsFall,20062DongmeiLiElectronicEngineeringDept.,TsinghuaUniversityAdvancedAnalogIntegratedCircuitsFall,20063DongmeiLiElectronicEngineeringDept.,TsinghuaUniversityAdvancedAnalogInt
4、egratedCircuitsFrequencyresponseofCascode11p=≈1R(C+C)R(C+2C)SGS1MSGS1GD1C≈2CMGD1òPismuchhigherthanthatofSCstage.1Fall,20064DongmeiLiElectronicEngineeringDept.,TsinghuaUniversityAdvancedAnalogIntegratedCircuitsFall,20065DongmeiLiElectronicEngineeringDept.,TsinghuaUni
5、versityAdvancedAnalogIntegratedCircuitsFall,20066DongmeiLiElectronicEngineeringDept.,TsinghuaUniversityAdvancedAnalogIntegratedCircuitsFoldedCascodeòFoldedCascode:NMOSCSfeedingintoPMOSCG,orviceversa.òBiasingbyaDCcurrentsourceisnecessary.Fall,20067DongmeiLiElectronic
6、EngineeringDept.,TsinghuaUniversityAdvancedAnalogIntegratedCircuitsSingle-StageAmplifiersCommon-Source(CS)AmplifierSourceFollowerCommonGateAmplifierCascodeStageDifferentialAmplifiersFall,20068DongmeiLiElectronicEngineeringDept.,TsinghuaUniversityAdvancedAnalogIntegr
7、atedCircuitsDifferentialPairRedefineVinv=v=v−vin.DMIDin1in2v+vin1in2v=v=in,CMIC2vSymmetricstructurein,DMv=v+in1in,CM2whenv=0IDvin,DMIv=v−I=I=SSin2in,CM2D1D22Fall,20069DongmeiLiElectronicEngineeringDept.,TsinghuaUniversityAdvancedAnalogIntegratedCircuitsDifferentialP
8、air(cont.)Properties:•Immunitytocommon-modesignal(noise)•IncreaseinmaximumachievablevoltageswingsRIDSSV−DD2V−RIDDDSSFall,200610DongmeiLiEl
