DESIGN OF EXTENDABLE BINARY TO GRAY CODE CONVERTERUSING QUANTUM-DOT CELLULAR AUTOMATA

One of the important codes, a gray code is normally used to detect correction of error in digital systems. Gray codes use a binary encoding scheme through grouping of the order of the bits and changing one bit of the group. Quantum-dot cellular automata (QCA) is a promising and a future technology for semiconductor transistor based technologies. We propose an extendable QCA binary to gray code converter in this paper. An Exclusive-OR gate is a core element in binary-to-code converter so we used an XOR gate using Nand-Nor-Inverter (NNI) gate which can simplify to logic circuits. The NNI gates are universal gates and can efficiently design XOR gates. A first proposed design is a 2-bit circuit and we extend it to 3-bit and to 4-bit designs. The proposed circuits are compared to previous designs and it shown its efficiency.