Proper

Abstract

Multiplication operations are used in various applications, including general numerical computation. Multiplier circuit hardware is essential for most advanced processors, and studies are underway to efficiently implement multipliers. Quantum-dot cellular automata (QCA) are an alternative circuit design technology that can overcome the limitations of complementary metal-oxide-semiconductor (CMOS) technology. QCA has the advantages of nanoscale size and low power consumption, and various QCA-based circuits have been designed. The QCA circuit can be divided into a coplanar structure composed of one layer and a multilayer structure composed of multiple layers. A coplanar structure has a more stable signal than a multilayer structure; however, the multilayer structure can efficiently organize wires in a circuit, e.g., a multiplier, and can output a stable signal by adjusting the clock signal and the interval between the wires. In this paper, we propose a QCA-based multiplier using a multilayer structure and compare it with an existing QCA multiplier. The proposed circuit used 357 cells, about 35% less than the existing circuit, and its area was about 50% smaller.