Design And Application Research Of Full Adder Based On QCA

Integrated circuit technology is developing rapidly in recent years. As the feature size of device enters into the nanometer region, a series of non-ideal phenomena appeared, such as leakage current, high power consumption, complex wiring, cross-talk and so on, which seriously impact the development of integrated circuit, so a new technology to replace the CMOS technology is needed. Researchers have developed a variety of new nano-devices, such as Quantum-dot cellular automata, single electron transistors, resonant tunneling diodes, and so on. Among them, Quantum-dot cellular automata provides a new mode of computing and information processing for its unique structural characteristics and assembling form. Compared with classic circuit, Quantum-dot cellular automata has advantage of lower power consumption, higher integration, faster operation frequency, which makes it most likely to replace the traditional CMOS technology.So far, the QCA circuits have been extensively studied and widely applied in memory, flip-flop, adder, multiplier, and so on, and FPGA system construct by QCA is also developing.Design and application of QCA full adder are researched in this dissertation. First, basic knowledge of QCA circuit is introduced, and then the clock schemes for QCA circuits are summarized. Finally by the early study of QCA circuit and the basic logic unit, an improved five input majority gate is proposed and applied to full adder. The results show that the full adder not only stable, but also has advantage on cell number and space. Based on the above work, in order to further study the application of full adder in digital circuit, the full adder is applied to implement large-scale circuit, including adder and multiplier. Simulation results illustrate that the circuits keep correct logic function and dominate the previous results.