Design of QCA circuits using new 1D clocking scheme

Abstract

This paper considers the proposed clocking scheme for Quantum-dot Cellular Automata (QCA) designs; this scheme utilizes only single or regular (900) cells for circuit design. Based on the analysis of previous schemes, use of single (regular) cells rather than both regular and rotated cells is believed to be an important idea for the QCA designs. According to the previous clocking schemes there are no such schemes exist where only single phase cells are used for circuit design. The main drawback of the previous schemes is that during the fabrication, there is a possibility of “cross-coupling” between the two wires of 900 and 450, when arrangement of any cells is misaligned. But there is no misalignment when only single cells are used. The proposed scheme is based on 1D clocking scheme and aim is to provide crossing and information flow with only single or regular cells. Some Combinational circuits such as Adders Half adder, Full adder, 2-Bit adder and 4-Bit adder are designed using proposed 1D clocking scheme with only regular cells (900). It is observed that the circuits designed using this proposed clocking scheme achieves same results in comparisions to the best previous relavant works. Simulation and Verification are carried out by QCADesigner.