Design of Single Bit Low Power Multiply Accumulate (MAC) Unit Using Quantum Dot Cellular Automata

Abstract

Quantum dot was invented at Bell labs in 1982 as light-emitting nanocrystals that can absorb light of one wavelength and convert it to another. In the nanoscale implementation, quantum dot has become a new emerging technology, as one of the most prominent research areas. It has the potential of getting applied in the construction of quantum computers as well as in communication switching networks. The proposed multiply-accumulate operation (MAC) unit can be used to reduce the processing time of the central processing unit (CPU) or arithmetic logical unit (ALU). In this paper the MAC unit has been designed to reduce the complexity of the cross-connect circuits. The complete circuit has been implemented using quantum dot cellular automata to reduce the power dissipation and cell area. The standard AND gate and full adder are the core aspects for the design of MAC architecture. This work involves the design of a low-power MAC unit circuit. The circuit can be used with cross-connect networks with M parallel operations and with N size networks to make M × N operations per unit time. The power dissipation has been computed as 2.416x10−9 W. The proposed design is superior than other designs based on non-quantum dot technology.