Full Adder

The circuit performs the mathematical function of adding three binary digits. The three digits are the Augend (A), Addend (B) and Carry Input (Cin). The addend and the carry input are added to augend generating Sum (SUM) and Carry Output (Cout) as output signals. The SUM output bit will be set if the number of input bits set to 1 is odd. Thus the SUM output can be generated by a three-input Exclusive OR (XOR) gate. The carry output (Cout) bit will be set if two or all of the input bits are 1s. Then, a three-input majority voting logic circuit can be used for carry output. Variables / Signal Names: Cin = Carry Input A = Augend B = Addend SUM = (Full adder) Sum Cout = (Full Adder) Carry Output