Designing a Content-Addressable Memory Cell Using Multiplexer in Quantum-Dot Cellular Automata

Abstract

Low power consumption, high density, regularity, and high speed are readily applicable to QCA. Therefore, memory is well suited for implementation using this technology. Because Content Addressable Memory (CAM) is a special type of memory structure used in very fast search applications, QCA can be used to design this memory at the nanoscale. In this paper, we introduce a new structure for the CAM cell. For this purpose, all the components needed to implement this memory cell are designed separately. In order to provide a structure with fewer gates, the operational equations of the components are considered in a way that they can be implemented by a unique multiplexer gate. For this purpose, a new multiplexer is used, which operates based on the Columbic interaction of cells. QCADesigner is used to simulate the proposed structures and verify their operation. The proposed structure has a 28% improvement in the number of cells and a 27% improvement in the occupied area.