Energy Dissipation Analysis of Sequential Circuits in QCA

Abstract

There are lot of alternate technologies in recent years at nano-scale to replace the conventional CMOS technology. Among the new devices, Quantum-dot Cellular Automata (QCA) is one such technology that relies on new physical phenomena called Columbic interactions. QCA is a nanotechnology that radically departs from a CMOS-based technology in terms of energy dissipation, occupational area and input to output delay. In this paper, the sequential circuits such as SR latch and D Latch has been designed with the help of QCA software. The simulation result shows that the proposed SR latch utilizes an area of 0.01 μm2 with 72 QCA cells and a delay of 2 clock cycles. Similarly, the proposed D latch has occupational area of 0.04 μm2 with 29 QCA cells and a delay of 1 clock cycle. The average energy dissipation of both the latches has been calculated at 0, 5, 10 and 15 Kelvin (K). The average energy dissipation of proposed SR latch at 0Kis 0.06212 meV, at 5K is 0.1574 meV, at 10K 0.09411 meV is and at 15K is 0.08988 meV. Similarly, the average energy dissipation of proposed D latch at 0K is 0.0257 meV, at 5K is 0.07066 meV, at 10K is 0.06987 meV and at 15K is 0.06713 meV