Design of Efficient Quantum-Dot Cellular Automata (QCA) MAC Unit

QCA technology has considerable advantages in comparison with Complementary Metal Oxide Semiconductor (CMOS) technology, such as extremely low power dissipation, high operating frequency, and a small size and can operate at one Terahertz. The Multiply -Accumulator (MAC) unit is considered as one of the essential operation in Digital Signal Processing (DSP). In the real-time DSP systems, several applications like speech processing, video coding and digital filtering etc, require MAC operations. However, the power dissipation and area are the most significant aspects in these systems. In this paper, low power MAC Unit based on QCA technology is designed. QCADesigner ver 2.0.3 is used to validate the accuracy of the proposed circuit. The power dissipation is estimated using QCAPro tool. The total power consumed by this unit is 4.03 mW. It is found that proposed design is better than other designs based on classical technology. As the works in the field of QCA logic signal processing has started to progress, the suggested contribution will give rise to a new thread of research in the field of real time signal processing.