A Novel Adder Circuit Design in Quantum-Dot Cellular Automata Technology

摘要

Quantum-dot Cell Automata (QCA) technology is a promising alternative technology for CMOS technology. In this technology, the ultra-dense and low-latency digital circuits are designed. One of the important digital circuits is Full Adder (FA). In this paper, a new and efficient multilayer QCA full adder circuit is designed and evaluated. In the designed full adder circuit, sum and carry output are designed in separated layers. Then, a novel and efficient 4-bit Ripple Carry Adder (RCA) circuit is designed based on this new FA circuit. The proposed QCA circuits are simulated using QCADesigner tool version 2.0.3. The simulation results show that the proposed 4-bit QCA RCA requires 135 QCA cells, 0.06m(2) area and 5 clock phases. The comparison shows that the proposed QCA circuits have advantages compared to other QCA circuits in terms of area, latency, and cost.