Abstract: Quantum-dot cellular automata are one of the best alternative technologies of CMOS at nano-scale. It is an emerging technology promising to design circuits with low power consumption, high density as well as high speed. Nanotechnology based QCA basic logic layouts work well while simulating on QCA Designer software. The full adder circuit is a basic unit in digital arithmetic and logic circuits. The design of adders has been reported by various researchers and most of the circuit combinations produce excellent results on simulation. We will understand in this paper to different type of full adder design and formulation to design it. We also try to design QCA full adder design using a different formula for sum and carry which is enhanced in term of cell numbers in comparison to other approaches Although design of QCA full adders has been reported by a large number of researchers but the simulation results on most of the circuits fail to produce claimed outputs as such the carry forward work is becoming difficult. There are certain difficulties in producing desired simulation results while joining two half adders to design full adder. The main cause for the problem seems to be the mismatch of input data, when earlier stage data is combined with the forward stage.
We are study and try to design our own circuitry to overcome issue on complex relation for designing a full adder with two half adder policy rather than we try to separate structure for full adder circuitry to improvise the desired result and minimum requirement of quantum cells. For This purpose we allow to choose different methodology and design techniques. We have tried to study some full adder designs on the basis of simulation results to move forward with our own designs for the purpose.
Keywords: Quantum Dot Cellular Automata, Nano Technology’ QCA full adder, QCADesigner.
Title: SURVEY ON 1-BIT FULL ADDER DESIGN IN QUANTUM DOT CELLULAR AUTOMATA
Author: Ritu Shivhare
International Journal of Electrical and Electronics Research
ISSN 2348-6988 (online)
Research Publish Journals
