Abstract
Quantum Cellular Automata (QCA) is a transistor-less computation model that addresses the problem of device interconnection and density which holds the promise of high speed and fewer sizes compare to the Complementary Metal Oxide Semiconductor (CMOS) design. In this study, the design of 4-bit down asynchronous counter which is the fundamental block of the digital technology using new D-Flip Flops (D-FF) layouts is discussed. This D-FF is designed using majority gates. The FF clock inputs are not driven by the same clock and each FF output depends on the previous output. This design finds its application in nanotechnology fields including medical field to monitor the patient’s activity by utilizing timer based tools. The design of 4-bit down asynchronous counter is simulated in the QCA design tool.
Highlights
Quantum Cellular Automata (QCA) systems consist of arrays of interacting cells
The design of QCA model is different from the conventional Complementary Metal Oxide Semiconductor (CMOS) design model due to their clocking approaches
4-bit asynchronous down counter using new D-Flip Flops (D-FF) layouts are realized in QCA technology
Summary
QCA systems consist of arrays of interacting cells. Each cell affects its neighbors and it is possible to propagate information and compute logic functions without physical signal propagation. Another application of crossing minimization algorithms is QCA. The non-adiabatic switching power and polarization error in QCA design circuits is estimated in [1] using a probabilistic modeling tool. A full adder is designed in [2] to enhance the switching level at nanoscale level with the help of high level synthesis. A QCA model is designed in [3] using majority gates and the model is employed in various parallel prefix adder
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