Design of efficient quantum Dot cellular automata (QCA) multiply accumulate (MAC) unit with power dissipation analysis

Abstract

Quantum dot cellular automata (QCA) is a hopeful technology in the field of nanotechnology that seems to suite well with signal-processing needs. It is concerned with great interest because of its benefits such as ultra-low power consumption, small size and can operate at one Terahertz. The multiply accumulator (MAC) unit is considered as one of the essential operations 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. Here, the authors design low power MAC unit based on QCA technology. QCADesigner version 2.0.3 is used to validate the accuracy of the proposed circuit. The reliability of this unit is taken at different temperatures. The power dissipation is estimated using QCAPro tool. The total power consumed by this unit is 2.183 μW. The proposed circuit has 90% improvement in terms of power over complementary metal-oxide-semiconductor (CMOS) circuits. Since 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 and image treatment.

QCA Based Design of Novel Low Power n-bit Ripple Carry Incrementer and Ripple Carry Decrementer

“…The QCA circuit of 4-bit incrementer requires 245 cells, 0.4536 μm² total area, 0.07938 μm² cell area, 16 Comparison is done on XOR gate with previous designs and explored in Table 5.It is observed from Table 5 that the proposed XOR gate has higher design complexity than other existing designs. But, in the proposed work, we have tried to show the design of the n-bit Ripple Carry Incrementer and Ripple Carry Decrementer circuit.…”

Single layer adder/subtractor using QCA nanotechnology for nanocomputing operations

“…The layout shown in figure 7 is used for the fault analysis. The cell missing defect is possible for the cells 7, 8, 9, 10, 12, 13, and 16, while the cells 1, 2, 3,4,5,6,11,14,15,17,18,19, and 20 causes cell addition defects. It is assumed that input and output cells are unchanged due to any type of fault defect.…”

“…The least value of QCA layout cost is desirable. Layout cost is derived as provided in equation (14).…”

“…Four phases are switch, hold, release, and relax. QCA cell starts polarizing in the switch phase and completely polarized in the hold phase [14]. Binary data flows during the switch and hold phases.…”

Design and Implementation of Nanotechnology QCA Geometric Greedy Router

“…e QCA clocking system consists of four phases, as illustrated in Figure 4. e phases are switch, hold, release, and relax [14]. e barriers are raised during the switch phase, and a cell is influenced by the polarization of its adjacent cells.…”