PHYS345 Electricity and Electronics

Answer for P9-18

Truth Table for Full Subtractor:

A F Bi D Bo
0 0 0 0 0
0 1 0 1 1
1 0 0 1 0
1 1 0 0 0
0 0 1 1 1
0 1 1 0 1
1 0 1 0 0
1 1 1 1 1

Karnaugh Map for D:       Karnaugh Map for Bo:
 Bi 0  1 
AF\
 00    0 1
 01    1 0
 11    0 1
 10    1 0

Boolean expression

     
 Bi 0  1 
AF\
 00    0 1
 01    1 1
 11    0 1
 10    0 0

Boolean expression

Logic Gates for Full Subtractor:

Full Subtractor Logic

3-Bit Subtractor:

3-Bit Subtractor


"http://www.physics.udel.edu/~watson/phys345/protected/exercises/answers/P9-18.html"
Last updated Nov. 21, 1998.
Copyright George Watson, Univ. of Delaware, 1998.