Decimal to Excess-3 and Excess-3 to Decimal Code Converters in QCA Nanotechnology

In this paper, two digital code converters are presented, excess-3 to decimal, and decimal to excess-3. The tile method is used to design proposed circuits in quantum-dot cellular automata (QCA) nanotechnology. The tile method gives a unique block for the majority and NOT gates. This property facilitates integrating circuits and since the NOT gate is not used in the tile method, the proposed circuits can do their work as fast as possible. Both of the proposed code converters has 1.75 clock cycles delay and have an energy dissipation of about 100meV. In the excess-3 code to decimal converter 516 cells are used, which occupy an area equal to 0.43µm 2 also in the decimal to excess-3 code converter. 321 cells are used, which occupy an area equal to 0.28 µm 2 .