Compact D Flip Flop in Quantum Dot Cellular Automata for Digital System

At present, solution to Complementary Metal Oxide Semiconductor technology is one of the efficient nanotechnology device Quantum Dot Cellular Automata. QCA works on the principle of columbic repulsion without transistor usage. In this research efficient and compact D flip flop is proposed. The design uses an efficient 2:1 multiplexer to achieve improved parameters in terms of total area, the number of cells, energy dissipation and delay. The proposed D flip flop shows 54% improvement compared with the existing design in the number of cells, less delay of just 0.25 clock phase with 7.05e-003 eV of total energy dissipation and 6.41e-004 eV of average energy dissipation. The layouts are designed and the result is verified in QCA Designer 2.0.3 and QCA Designer E tool.