MOSFET Characteristics- Theory and Practice

Basics of the MOSFETThe MOSFET OperationThe ExperimentMOSFET characteristics - Theory and PracticeDebapratim Systems GroupDepartment of Electrical EngineeringIndian Institute of Technology Bombay20 September 2012 Debapratim GhoshDept. of EE, IIT Bombay1/20 Basics of the MOSFETThe MOSFET OperationThe ExperimentMOS StructureMOS Structure OperationIntroduction- the MOSFETM etalOxideSemiconductorFieldEffectTransis torThe name describes nearly everything about the device first three wordsMetalOxideSemiconductor describes the layer-wisestructure of the last three wordsFieldEffectTransistor describes the principle GhoshDept. of EE, IIT Bombay2/20 Basics of the MOSFETThe MOSFET OperationThe ExperimentMOS StructureMOS Structure OperationMOS Structure PhysicsMOS transistors can be of two types- NMOS and NMOS has a lightly doped p-substrate (where there is scarcity ofelectrons).The metal terminal is called the oxide layer (usually SiO2) is an p-type substrate is grounded while the gate voltageVGis will see how the MOS structure behaves asVGis GhoshDept.

Basics of the MOSFET The MOSFET Operation The Experiment The MOS Transistor Operating Regions of the MOSFET TheMOSTransistor Once the threshold has been crossed, we need to make the electrons move, i.e. set up a current. For this, we need two more terminals- Source (S) and Drain (D), and a potential across them to control the flow of electrons.

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