Design of novel efficient XOR gates for quantum-dot cellular automata

摘要

The use of quantum-dot cellular automata (QCA) is a promising emerging technology for implementing digital circuits at the nanoscale level. Devices based on QCA hold the promise of faster speeds and greatly reduced sizes. This paper presents novel efficient designs for QCA XOR and parity checker. For verifying the functionality of the circuits, these structures are designed and simulated using QCADesigner software. The results confirm that all the proposed circuits hold correct logic function. The proposed designs are also compared with the other previous works according to the area, cell count and delay. Compared to the best previous XOR design, the best proposed XOR reduces the area, cell count and the wasted area in cells by 83%, 54% and 86% respectively. Furthermore, our designs are faster than previous works. We have also compared our QCA designs with conventional CMOS technology. The results confirm that the QCA designs are more efficient in term of area and clock frequency.