Design and Analysis of a Novel Low-Power Exclusive-OR Gate Based on Quantum-Dot Cellular Automata

Recently reported quantum-dot cellular automata (QCA) exclusive-OR gate designs are usually made with the AND-OR-INVERTER method in which it is difficult to optimize the XOR gate. This paper presents a novel low-power exclusive-OR (XOR) gate which is mainly based on cell-level format. Compared with the previous XOR gates, the proposed XOR gate performs in a different manner. This XOR gate design is accomplished by the intercellular effects method. For better performance comparison with previous relevant works, 4-, 8-, 16- and 32-bit parity generators are implemented in this paper. The simulation results show that there is a reduction of 32.5% cell count and 21.5% area in comparison with the existing advanced 32-bit parity generator. Especially in the aspect of clock cycle, the proposed design reduces the delay by 50% compared to the previous design. For simulation analysis, QCADesigner tool is used to verify the correctness of the proposed design. QCApro tool is used to evaluate the power dissipation of this design.