Design of an ultra-high-speed coplanar QCA reversible ALU with a novel coplanar reversible full adder based on MTSG
Department of Computer Engineering, Semnan Branch, Islamic Azad University, Semnan, Iran
2 Department of Computer Engineering, Babol Branch, Islamic Azad University, Babol, Iran
3 Industrial Nanotechnology Research Center, Tabriz Branch, Islamic Azad University, Tabriz, Iran
Accepted: 19 April 2023
Published online: 31 May 2023
The amount of occupied area and energy waste are among the salient indexes that are important in designing and implementing digital circuits. Hence, the inherent properties of the quantum-dot cellular automata (QCA), like ultra-dense structure and ultra-low power consumption, have made this nanotechnology a viable substitute for complementary metal–oxide–semiconductor technology. The arithmetic logic unit (ALU) is each processor's operational and inseparable component. In this paper, a novel reversible ALU is proposed, which comprises a double Feynman gate, two Fredkin gates, and a new coplanar reversible full adder based on the modified TSG in QCA nanotechnology. This structure is implemented by 247 QCA cells in a 0.332 μm2 area, which uses the coplanar clock-zone-based crossover. This layout can perform 20 various arithmetic and logic operations, and its latency is nine clock phases. The proposed QCA layouts are evaluated and simulated by QCADesigner version 2.0.3. The simulation outcomes indicate that the proposed coplanar QCA ALU has a 14.28%, 40%, 48.54%, and 50.3% improvement in quantum cost, latency, cell count, and area occupancy, respectively, compared to the prior best coplanar architecture.
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