39. ABK + ABK
41. After a simplified expression has been extracted from a
+ ABK + ABK
Veitch diagram, the final step in designing logic circuits,
using Boolean algebra, is to draw the appropriate logic
diagram to represent the simplified expression. The sum
expression and the carry expression for a circuit which will
add two binary digits are
AB + AB SUM EXPRESSION
AB
CARRY EXPRESSION
Since there are two outputs consisting of (1) the sum output
and (2) the carry output, the logic diagram must show two
outputs when completed.
40. a. X(X+Y) =X
To diagram the sum output, first recognize the expression
1
AB + AB as an overall two-input OR circuit containing inputs
1
1
AB and AB. The first step in drawing the logic diagram is
b. Yes
shown below.
Diagram each input and draw the appropriate logic symbols
as follows:
IT 0346
1-28
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