A novel approximate Full Adder cell is presented which is based on the ‎combination of standard CMOS logic and pass transistor logic styles. The ‎carbon nanotube field-effect transistor technology is used to simulate and implement ‎the proposed cell. Comprehensive simulations at various power supplies, output loads, and ‎ambient temperatures are conducted using the HSPICE tool. According to simulation results, its ‎delay, power-delay product, energy-delay product, and normalized energy-delay-‎area product improve by 18%, 10%, 39%, and 15% compared with the best existing ‎design. The effects of diameter variations of carbon nanotubes on the functionality of ‎the circuits are studied by Monte Carlo transient analysis. Simulation results confirm that ‎the proposed cell is resistant to the process variations. At the application level, all circuits are ‎employed in image blending to assess their efficacy in terms of peak signal-to-noise ratio ‎and structural similarity index criteria using the MATLAB tool. Simulation ‎results of image processing indicate that the proposed cell has a reasonable functionality and ‎produces output images with adequate quality to be inferred by humans.‎

No abstract