Studio_3

Studio_3 - Studio 3 Review MOSFET as current source Small...

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1 Studio 3 Review MOSFET as current source Small V DS : Resistor (value controlled by V GS ) Large V DS : Current source (value controlled by V GS )
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2 Simulation Review: Circuit Fixed V GS , Sweep V DS V DS I D
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3 Simulation Review: Result Follows linear R on model only for “small” V DS V DS I D SLOPE = 1 / R on
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4 Simulation Review: Result Medium V DS < V GS - V TH : nonlinear (“triode” region) Large V DS > V GS - V TH : I D determined (mostly) by V GS ("saturation" region) Small V DS linear R on V DS I D
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5 MOSFET Behavior MOSFET channel behaves differently as the channel drain-source voltage V DS increases: Small V DS : linear V DS -I D relationship (model as R on ) Medium V DS < V GS - V TH : nonlinear (“triode”) relationship Large V DS > V GS - V TH : approximately constant current determined (mostly) by V GS
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6 What Changed? Reexamine R on derivation: Apply V GS : inversion layer of mobile charge V GS > V TH FIXED MOBILE
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7 Reexamine R on Derivation Calculate mobile channel charge Assumed same voltage along channel Q = Cgs(V GS - V TH )
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8 What Changed: Voltage in V DS Channel Problem: apply V DS (to make current flow) V TH =+1V
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This note was uploaded on 10/13/2009 for the course ECE 4902 taught by Professor Mcneill during the Spring '01 term at WPI.

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Studio_3 - Studio 3 Review MOSFET as current source Small...

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