Implementation of Digital Differentiators using Quantum-dot Cellular Automata

Abstract

when it come to scaling of the circuits, the CMOS (Complementary metal-oxide-semiconductor) technology  is no longer in the effect, as the semiconductor industry  has come up with many number of technologies to reduce the size of the circuit and a single component the technologies has been changed. One of them is the Quantum-dot Cellular Automata. The size of the basic cell used in QCA is in nanometer. Hence by using the Quantum-dot Cellular Automata(QCA) various circuits are designed, here in this work the design of a digital differentiator has been considered. The digital differentiators like First Difference Differentiator, Central Difference Differentiator and the Bilinear Transformation of the IIR filters has been realized. These simple circuits can be further extended to the higher number of bits and be used in the DSP filters. These are realized by using the software QCADesigner, the software used to realize the QCA circuits. By using the arrangement of the cells of the size in terms of nanometers the circuits are designed.