Lecture#ingupaweekfromMonday(October18th)NextWeek:Review,examples,circuitsReading:MOS:chapter1410/8/20041EE42fall2004lecture17MidtermMonday,October18,InclassOnepage,onesideofnotes10/8/20042EE42fall2004lecture17TopicsToday:MetalOxideSemiconductor(MOS)TransistorsPhysicalstructurePhysicaloperationCircuitsymbolandcurrent/voltagedesignationsModesofoperationI-VRelationshipSolutionofMOScircuits10/8/20043EE42fall2004lecture17MOStransistorThebipolartransistorcontrolscurrenttroughareversebiaseddiode,soitisintrinsicallyacurrentcontrolleddevice,,,avoltageisappliedtoametallayer,,,itattractsholesintothesemiconductorIfthevoltageonthemetalispositive,itattractselectronsintothesemiconductorSemiconductorOxideMetal-------------------------10/8/20046EE42fall2004lecture17TheMOSasaswitchIftherearemobilecarriersinthesemiconductor,theycanconductacurrent.(switchclosed),thennocurrentcanflow(switchopen)10/8/20047EE42fall2004lecture17NMOSandPMOSWhatdeterminesifthemobilecarriersthatadeviceusesareholesorelectrons?,theywillallowelectronstoflowundertheoxide,butholeswouldbeblockedbyareversebiaseddiodeIfthecontactsontheendsarePtype,theywillallowholestoflowundertheoxide,-typemetalmetaloxideinsulatormetalp-typemetalgatesourcedrainn-typeNMOS(N-ChannelMetalOxideSemiconductor) Transistor10/8/20
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