Electronics-I Lecture 35

Electronics-I - resistance (FETs ApplyingsmallvDS byvGS vt asvGSexceedsvt channel iD=iS iG=0

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Lecture 35 Electronics I 1 MOSFET operates at linear  resistance Value of resistance controlled  by v GS Resistance is infinite for v GS    v t Value of resistance decreases  as v GS  exceeds v t Enhancement-type MOSFET Increasing v GS  enhances the  channel  i D  = i S i G  = 0 Field Effect Transistors (FETs) Applying small v DS  
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Lecture 35 Electronics I 2 MOSFET Device Operation         With increased v DS As v DS  is increased v GS  held constant v DS  appears as a  voltage drop across  the length of the  channel  Voltage at Source end  is 0 Voltage at Drain end is  v DS Channel is tapered v GS  at source end v GS  - v DS  at drain end 
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Lecture 35 Electronics I 3 MOSFET Operation at Pinched Off v DS  increased Channel becomes  more tapered Resistance  increases  correspondingly i D  vs. v DS With increased v DS No longer a straight  line v GS  - v DS  = v t Channel depth at  drain end reduces to  zero Pinched off
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Lecture 35 Electronics I 4 MOSFET Device Operation 
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This note was uploaded on 12/12/2010 for the course EE 1 taught by Professor Shahidanwar during the Spring '10 term at NUCES.

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Electronics-I - resistance (FETs ApplyingsmallvDS byvGS vt asvGSexceedsvt channel iD=iS iG=0

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