Full Adder

·         Full Adder is a combinational logic circuit.

·         It is used for the adding two single bit numbers with a carry and generates the outputs in the form of SUM and CARRY

·         Full adder contains 3 inputs and 2 outputs (SUM and CARRY) as shown-

Full Adder Designing-

Step-01:

Identify the input and output variables-

·         Input variables = A, B, C_in (either 0 or 1)

·         Output variables = S, C_out where S = Sum and C_out = Carry

Step-02:

Draw the truth table-

Step-03:

Draw K-maps using the above truth table and determine the simplified Boolean expressions-

Step-04:

Draw the logic diagram.

The implementation of full adder using 1 XOR gate, 3 AND gates and 1 OR gate is as shown below-