Shannon Logic Based Novel QCA Full Adder Design with Energy Dissipation Analysis

Quantum-dot Cellular Automata (QCA) is an emerging nanotechnology to replace VLSI-CMOS digital circuits. Due to its attractive features such as low power consumption, ultra-high speed switching, high device density, several digital arithmetic circuits have been proposed. Adder circuit is the most prominent component used for arithmetic operations. All other arithmetic operation can be successively performed using adder circuits. This paper presents Shannon logic based QCA efficient full adder circuit for arithmetic operations. Shannon logic expression with control variables helps the designer to reduce hardware cost; using with minimum foot prints of the chip size. The mathematical models of the proposed adder are verified with the theoretical values. In addition, the energy dissipation losses of the proposed adder are carried out. The energy dissipation calculation is evaluated under the three separate tunneling energy levels, at temperature T = 2K.The proposed adder dissipates less power. QCAPro tool is used for estimating the energy dissipation. In this paper we proposed novel Shannon based adder for arithmetic calculations. This adder has been verified in different aspects like using Boolean algebra besides it power analysis has been calculated. In addition 1-bit full adder has been enhanced to propose 2-bit and 4-bit adder circuits.