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1、Samplingswitches,chargeinjection,NyquistdataconverterfundamentalsTuesday,February8th,9:15–11:35SnorreAunet(sa@ifi.uio.no)NanoelectronicsgroupDepartmentofInformaticsUniversityofOsloLastweek–Tuesday,February1st11.1Generalconsiderations11.2Supply-independentbiasing11311.3TtTemperature-idindepen
2、dtdentRfReferences11.3.1NegativeTC-voltage11.3.2PositiveTC-voltage11.3.3Bandgapreference11.4PTATCurrentgeneration11.5Constant-GmBiasing12.2Sampling12.2SamplingSwitches12.3SwitchedCapacitoramplifiers1Today,Februarythe8th•12.2Samplingswitches•12.2.1MOSFETSasSwitches•12.2.2Speedconsiderations•1
3、22312.2.3PiiPrecisionconsiderations•12.2.4Chargeinjectioncancellation•12.3Switched-CapacitorAmplifiers•12.3.1Unity-GainSampler/buffer•12.3.2Noninvertingamplifier•12.3.3PrecisionMultiply-by-TwoCircuit•12412.4SithdSwitched-CiCapacittorItIntegrattor•12.5SCcommon-modefeedback•Dataconverterfundam
4、entals(”Maloberti”++)8.februar20113Track(/sample-)andHoldcapabilitiesofasamplingcircuit(ch.12.2in”Razavi”)8.februar201142S/Hsignals(clk,Vin,VCH,Vout)test5Track(/sample-)andHoldcapabilitiesofasamplingcircuit1/2(ch.12.2in”Razavi”)•CKgoeshighatt=t0.Vin=0fort≥0.CHinitiallyhasavoltageequaltoVdd.•
5、AttAttt=t0M1operatesinsaturation,butfallsintothetrioderegionaftersometime,whenVout=Vdd–VTH.DischargingcontinuesuntilVoutapproacheszero.•Currentwheninsaturation:8.februar201163Track(/sample-)andHoldcapabilitiesofasamplingcircuitII/II(ch.12.2in”Razavi”)•CKgoeshighatt=t0,whenVout=0V,andVdd=3V.•
6、M1’ssourceisconnectedtoCH,andthetransistorturnsonwithVGS=3V,butVDS=1V.Thus,M1operatesinthetriode(”linear”)region,chargingCHuntilVoutappoaches1V.7AcoupleofobservationsregardingtheMOSswitch(ch.12.2in”Razavi”)•WehaveseenthataMOSswitchcanconductcurrentineitherdirectionsimplybyexchangingtheroleof
7、thesourceanddrainterminals.•Whentheswitchison,VoutfollowsVin.•Whentheswitchisoff,Voutremainsconstant(Fig12.10b)).84(Ex.12.2in”Razavi”)Voutasasafunctionoftime,forFig.12.9a)(λ=0)8.februar20119MaximumoutputofNMOSS/H(ch.12.2in”Razavi”,pp.412)•AssumeVin
