Design Of Quantum-dot Cellular Automata Circuit

With the rapid development of CMOS technology,the integration density of integratedcircuits continues to increase, the size of the device reaches nano meter level. These also bringsmore and more problems such as high power consumption, interconnection and so on.Meanwhile , noise and electro-migration at metal connections result in the decline of performance.In order to solve these problems, Lent et al. proposed Quantum-dot Cellular Automata,(QCA) asan alternative to the traditional CMOS technology in 1993.This paper firstly introduces the background, development and application of related fields ofthe QCA at home and abroad. Furthermore, this article expounds the basic structure, workingprinciple and performance characteristics of the binary QCA cells. And based on the lowestenergy principle of semi-classical theory, the QCA line , basic logic devices and OR andexclusive-OR gates are simulated by using Matlab. The genetic algorithm is also applied tosimulate circuits and greatly reduces time of simulation and the simulation results prove thecorrectness of the QCA circuit design.The results show that the QCA exclusive-OR circuit greatly simplifies the existing QCAexclusive-OR circuit structure. Simulation QCA circuit with Matlab is a kind of innovativemethod. The genetic algorithm used to the QCA circuit is also one of the important andbeneficial trial of this paper.A ternary valued QCA basic logic gate is also designed and the simulation results show thatternary valued logical model cannot be entirely followed with binary valued logical model.