Tile-based QCA design using majority-like logic primitives

Abstract

The design of circuits and systems in Quantum-dot Cellular Automata (QCA) is still in infancy. The basic logic primitive in QCA is the majority voter (MV), that is not a universal function; so, inverters (INV) are also required. Blocks (referred to as tiles) are utilized in this article. A tile with a combined logic function of MV and INV (MV-like function) is proposed. It is shown that the MV-like tile can be effectively used in logic design as basic primitive. Tiles based on both the fully populated (FP) and non-fully populated (NFP) grids are investigated in detail. Various arrangements in inputs and outputs are also possible among the 4 sides of a grid, thus defining different tiles. Using a coherence vector simulation engine, it is shown that the 3 × 3 grid offers versatile logic operation. Different combinational functions such as majority-like and wire crossing are obtained using these tiles. Tile-based design of different circuits is compared to gate-based and SQUARES designs.

A tiled programmable fabric using QCA

“…The concept of using tiles to modularize designs is not new in the QCA arena [12], [13]. A tile is an arrangement of QCA cells designed to implement a function.…”

Extendable Quantum-Dot Cellular Automata Decoding Architecture Using 5-Input Majority Gate

“…One of solutions is a quantum-dot cellular automata (QCA). It not only gives a solution at nano-scale, but also offers new techniques of computation and data transmission [6][7][8][9][10][11][12][13][14].…”

Design of defect tolerant tile-based QCA circuits

“…Regular designs in QCA offer the additional advantage of simpler partitioning into clocking zones for timing using an underlying CMOS circuitry. [3] has proposed a 3×3 grid (2D) array as basic logic element for QCA. Its logic behavior is a function of the presence/absence of one or more cells in the deposition process.…”

“…The implementation of this grid can possibly be realized through a DNA raft formed from nine tiles binding together as a 3 × 3 tile and any missing cell (undeposited) can be modelled with no QCA molecular attachment. In this paper, the approach of [3], [2] is further developed and a generalized concept of QCA tiling that is amenable to CAD, is introduced. Based on the arrangement, a computer-aided-design (CAD) environment for defect-tolerant logic synthesis of QCA designs is presented and a detailed performance analysis is performed.…”