PHYS345 Electricity and Electronics

Answer for 13.35

Truth Table for Full Adder:

Ci A B Co 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

Karnaugh Map for S:       Karnaugh Map for Co:
 AB 00  01  11  10 
Ci\  
 0     0   1   0   1 
 1     1   0   1   0 

Boolean expression

     
 AB 00  01  11  10 
Ci\  
 0     0   0   1   0 
 1     0   1   1   1 

Boolean expression

Logic Gates for Full Adder:

Full Adder Logic

3-Bit Subtractor:

4-Bit Adder

You might also enjoy examining the full subtractor.


"http://www.physics.udel.edu/~watson/phys345/protected/exercises/answers/13-35.html"
Last updated Nov. 8, 1999.
Copyright George Watson, Univ. of Delaware, 1999.