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Digital Electronics
NUMBER SYSTEM
BINARY CODES
BOOLEAN ALGEBRA
K MAPS
COMBINATIONAL CKT
INTRODUCTION
ADDER
FULL ADDER(FA)
FA using HAs
BINARY ADDER
SERIAL ADDER
PARALLEL ADDER
CARRY LOOK AHEAD ADDER (CLA)
QUESTION (BCD to Excess-3 using ADDER)
SUBTRACTORS
FULL SUBTRACTOR
FS using HSs
MORE QUESTIONS
SEQUENTIAL CIRCUITS
TIMING CIRCUITS

Subtraction using adder:

We can also do subtraction using adders. As we have already studied that we can do subtraction by 2’s compliment method in which we add 2’s compliment of subtrahend to minuend and 2’s compliment can be found by inverting all bits of subtrahend and then adding one. So we have to do as

F= A – B = A + 2’S compliment of B = A + 1’S compliment of B + 1

So we give A at one input, invert of B at 2nd input and give 1 at carry. Hence we implement the above function.

 

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