Question
Download Solution PDFIn full adder, there are
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFA full adder circuit has three binary digit inputs (two input bits and one carry input bit) and two binary digit outputs, Sum bit and carry output bit.
A Full adder can be realized using two half adders as shown:
A full adder can be implemented using 2 XOR, 2 AND, 1 OR as shown in figure:
The truth table of a full adder logic is:
|
A |
B |
C |
Cin |
S |
|
0 |
0 |
0 |
0 |
0 |
|
0 |
0 |
1 |
0 |
1 |
|
0 |
1 |
0 |
0 |
1 |
|
0 |
1 |
1 |
1 |
0 |
|
1 |
0 |
0 |
0 |
1 |
|
1 |
0 |
1 |
1 |
0 |
|
1 |
1 |
0 |
1 |
0 |
|
1 |
1 |
1 |
1 |
1 |
The Sum output bit of a full adder is given by:
S = A ⊕ B ⊕ C
The carry output bit of a full adder is given by:
X1 = AB + BC + AC
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