Friday, 30 November 2012

Adder-Subtracter Arithmetic Circuit

By on 00:39

As we know that in Mathematics we can write 5+(-2) instead of 5-2(both result are same),So this maths rule is also apply in digital binary no. also.In this situation we can use both circuit(adder-subtracter) at a same time.

Half Subtracter:-

Truth table of Half Subtracter:-

ABDifferenceBorrow out
00        0        0
01        1        1
10        1        0
11        0        0


Borrow out=A'B

Block Diagram:-

Logic Circuit:-

4 Bit Parallel Adder-Subtracter:-

4 Bit Serial Adder-Subtracter:-

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