Lecture 24 MOSFET Basics (Understanding with no math ...
Lecture 24
MOSFET Basics (Understanding with no math)
Reading: Pierret 17.1-17.2 and Jaeger 4.1-4.10 and Notes
Georgia Tech
ECE 3040 - Dr. Alan Doolittle
MOS Transistor
Qualitative Description
Flow of current from "Source" to "Drain" is controlled by the "Gate" voltage.
Control by the Gate voltage is achieved by modulating the conductivity of the
semiconductor region just below the gate. This region is known as the channel
Georgia Tech
ECE 3040 - Dr. Alan Doolittle
MOS Transistor
Qualitative Description
n-channel MOS Transistor
p-channel MOS Transistor
D + VDS
D VSD
G B
G B
+
-
+
VBS
-
VSB
VGS S -
VSG S +
Note: All voltages are shown in their "positive " direction. Obviously, VYX=-VXY for any voltage
G=Gate, D=Drain, S=Source, B=Body (substrate, but to avoid confusion with substrate, B is used)
Georgia Tech
ECE 3040 - Dr. Alan Doolittle
MOS Transistor
Qualitative Description
Assume an n-channel (receives it's name from the "type" of channel present when current is flowing) device with its source and substrate grounded (i. e., VS=VB=0 V).
For any value of VDS:
?when VGS VT , an induced n- type region, an "inversion layer", forms in the channel and "electrically connects" the source and drain.
Inversion layer (n-type)
Georgia Tech
P-type
ECE 3040 - Dr. Alan Doolittle
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