(1)
xperiment
E
AND-OR-INVERTER (A-O-I) Gate Circuit
:
bjective
O
Understanding the basic principles of combined logic.
ntroduction:
I
AND-OR-INVERTER (A-O-I)
gates consist of two AND gates,
one
OR
gate
Inverter
(NOT)
Gate.
and
one
The Boolean expression for the output F4 is:
)
Equation (1
F =
:
F=( + ).( + )
Equation (2)
Equation (1) is also referred to as (Sum of Products)
Equation (2) is also referred to as (Product of Sum)
c )
block
(
33002
-
Digital Logic Lab; Module KL
:
quipments Required
E
:
rocedures
P
1. Connect inputs (A, A
1
, B, B
1
) to Data Switches SWo, SW
1
, SW
2
, SW
3
respectively
and connect outputs F
3
, F
4
to logic indicators L
1
, L
2
.
2. Set B and B1 to '0', follow the input sequences for A and Al in Table (3-1) and
record the output.
=
3. What does F3 act Between A & A1?
4. Set
A
=
A1
=
0,
follow
the
input
sequences
for
B
&
B1
in
Table (3-2)
and
record
the
output.
What does F3 act Between B & B1?
1
gate between B and B
D
act as an AN
3
, Does F
'
0
'
1
A
and
When A
5.
6. Follow the following table and record the output?
equal
to
A.A1 + B.B1
3
F
Prove that
F3
B1
B
A1
A
0
0
0
0
1
0
0
0
0
1
0
0
1
1
0
0
0
0
1
0
1
0
1
0
0
1
1
0
1
1
1
0
0
0
0
1
1
0
0
1
0
1
0
1
1
1
0
1
0
0
1
1
1
0
1
1
0
1
1
1
1
1
1
1
F3 F4
A1 A
0 0
0 1
1 0
1 1
F3 F4
B1 B
0 0
0 1
1 0
1 1
Table(3-1)
Table(3-2)
Table(3-3)
7. If B= A' and B1= A1' , What do the output functions
(F3
&
F4) represent?
Why?
Discussion:
1.What logic does the A-O-I circuit represent?
a. AND b. NAND c.
Both
. What is the output of an A-O-I gate?
a.
b. (A+B).(C+D) c. ABCD
.
expressed as:
a. AB + CD
b.
(A+B).(C+D) c .ABCD
4. What are the advantages of using AOI?