OICC Press International Journal of Nano Dimension 2228-5059 14 3 (July 2023) 2024 03 03 A fast approximate quaternary full adder using a parallel design based on Carbon nanotube FET 10.22034/ijnd.2023.1988300.2224 EN Alireza Bolourforoush Department of Computer Engineering, Kerman Branch, Islamic Azad University, Kerman, Iran. 0009-0006-5446-8858 Mokhtar Mohammadi Ghanatghestani Department of Computer Engineering, Bam branch, Islamic Azad University, Bam, Iran. 0000000198739484 Journal Article 2024 03 03 Novel design methodologies of digital circuits have been caught in the spotlight of attention as a result of the dramatic increase in available data and the requirement for data processing among which Full adder cells are significant elements in arithmetic circuits design. The use of approximate computing and Multi Value Logic (MVL) can improve computational circuit efficiency. Carbon Nano Tube Field Effect Transistors (CNTFETs) with an adjustable threshold voltage is effective in the design of MVL circuits. This paper proposes a new CNTFET-based approximate quaternary full adder to reduce the area, delay, and power consumption. The Synopsys HSPICE results obtained based on 32nm Stanford CNTFET technology showed that the proposed model had much lower average power consumption, delay, power-delay product (PDP), and size as compared to other approximate full adders.