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Dr. S.Meenatchi Sundaram, Department of Instrumentation & Control Engineering, MIT, Manipal
ICE 4010: MICRO ELECTRO MECHANICAL SYSTEMS (MEMS)
Lecture #05
CMOS Logic Gates
Dr. S. Meenatchi Sundaram
Email: [email protected]
1
CMOS NAND Gate
2Dr. S. Meenatchi Sundaram, Department of Instrumentation & Control Engineering, MIT, Manipal
A B Y
0 0
0 1
1 0
1 1
A
B
Y
CMOS NAND Gate
3Dr. S. Meenatchi Sundaram, Department of Instrumentation & Control Engineering, MIT, Manipal
A B Y
0 0 1
0 1
1 0
1 1
A=0
B=0
Y=1
OFF
ON ON
OFF
CMOS NAND Gate
4Dr. S. Meenatchi Sundaram, Department of Instrumentation & Control Engineering, MIT, Manipal
A B Y
0 0 1
0 1 1
1 0
1 1
A=0
B=1
Y=1
OFF
OFF ON
ON
CMOS NAND Gate
5Dr. S. Meenatchi Sundaram, Department of Instrumentation & Control Engineering, MIT, Manipal
A B Y
0 0 1
0 1 1
1 0 1
1 1
A=1
B=0
Y=1
ON
ON OFF
OFF
CMOS NAND Gate
6Dr. S. Meenatchi Sundaram, Department of Instrumentation & Control Engineering, MIT, Manipal
A B Y
0 0 1
0 1 1
1 0 1
1 1 0
CMOS NAND Gate
7Dr. S. Meenatchi Sundaram, Department of Instrumentation & Control Engineering, MIT, Manipal
Series and Parallel
8
• nMOS: 1 = ON
• pMOS: 0 = ON
• Series: both must be ON
• Parallel: either can be ON
Dr. S. Meenatchi Sundaram, Department of Instrumentation & Control Engineering, MIT, Manipal
(a)
a
b
a
b
g1
g2
0
0
a
b
0
1
a
b
1
0
a
b
1
1
OFF OFF OFF ON
(b)
a
b
a
b
g1
g2
0
0
a
b
0
1
a
b
1
0
a
b
1
1
ON OFF OFF OFF
(c)
a
b
a
b
g1 g2 0 0
OFF ON ON ON
(d) ON ON ON OFF
a
b
0
a
b
1
a
b
11 0 1
a
b
0 0
a
b
0
a
b
1
a
b
11 0 1
a
b
g1 g2
Compound Gates
9
• Compound gates can do any inverting function
• Ex:
Dr. S. Meenatchi Sundaram, Department of Instrumentation & Control Engineering, MIT, Manipal
(AND-AND-OR-INVERT, AOI22)Y A B C D= +i i
A
B
C
D
A
B
C
D
A B C DA B
C D
B
D
YA
CA
C
A
B
C
D
B
D
Y
(a)
(c)
(e)
(b)
(d)
(f)
Compound Gates
10
• O3AI
• Ex:
Dr. S. Meenatchi Sundaram, Department of Instrumentation & Control Engineering, MIT, Manipal
( )Y A B C D= + + i
A B
Y
C
D
DC
B
A
Compound Gates
11Dr. S. Meenatchi Sundaram, Department of Instrumentation & Control Engineering, MIT, Manipal
Compound Gates
12Dr. S. Meenatchi Sundaram, Department of Instrumentation & Control Engineering, MIT, Manipal
Compound Gates
13Dr. S. Meenatchi Sundaram, Department of Instrumentation & Control Engineering, MIT, Manipal
a b ā �� T1 T2 T3 T4 T5 T6 T7 T8 Y
0 0 1 1 OFF ON ON ON OFF ON OFF OFF OFF
0 1 1 0 ON ON ON OFF OFF OFF OFF ON ON
1 0 0 1
1 1 0 0
T1
T2
T3
T4
T5
T6
T7
T8
Compound Gates
14
• A EXOR B
Dr. S. Meenatchi Sundaram, Department of Instrumentation & Control Engineering, MIT, Manipal
