• firdous ahmad

Quantum-dot cellular automata, is among the most promising nanotechnologies for the substitution of current Metal Oxide Semiconductor Field Effect Transistor (MOSFET) based devices. This technology promises of high switching speed, low power consumption and high device density in comparison to traditional technology. Several combinational and sequential logic circuits have been proposed. Therefore, lots of attentions have been paid to digital arithmetic QCA circuits. Adder circuits are most widely investigated and analyzed, because adder operation can directly affect the digital system performances. In this paper, a new multilayer ultra-high speed QCA full adder logic design is proposed using single OMG and m-RMG, which computes Sum and Carry, respectively. The proposed adder circuit consists of less area, less circuit complexity and reduced clock delays. In addition, ultra-dense new 4-bit & 8-bit ripple carry adder circuits have been proposed using presented one-bit multilayer adder circuit. Detailed structural analyses are performed in different aspects to authenticate the proposed adder circuit has achieved significant performance in comparison to traditional approaches. QCADesigner tool Ver. 2.0.3 is used to verify the correct circuit functionality.

"Implementation of an Ultra High Speed Multilayer Adder Logic Design Using Quantum-dot Cellular Automata", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 5, page no.725-733, May-2018, Available :http://www.jetir.org/papers/JETIR1805131.pdf

"Implementation of an Ultra High Speed Multilayer Adder Logic Design Using Quantum-dot Cellular Automata", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 5, page no. pp725-733, May-2018, Available at : http://www.jetir.org/papers/JETIR1805131.pdf