Ultra-Low-Cost Design of Ripple Carry Adder to Design Nanoelectronics in QCA Nanotechnology

Mohsen Vahabi, Ali Newaz Bahar, Akira Otsuki, Khan A. Wahid

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


Due to the development of integrated circuits and the lack of responsiveness to existing technology, researchers are looking for an alternative technology. Quantum-dot cellular automata (QCA) technology is one of the promising alternatives due to its higher switch speed, lower power dissipation, and higher device density. One of the most important and widely used circuits in digital logic calculations is the full adder (FA) circuit, which actually creates the problem of finding its optimal design and increasing performance. In this paper, we designed and implemented two new FA circuits in QCA technology and then implemented ripple carry adder (RCA) circuits. The proposed FAs and RCAs showed excellent performance in terms of QCA evaluation parameters, especially in cost and cost function, compared to the other reported designs. The proposed adders’ approach was 46.43% more efficient than the best-known design, and the reason for this superiority was due to the coplanar form, without crossovers and inverter gates in the designs.

Original languageEnglish
Article number2320
JournalElectronics (Switzerland)
Issue number15
StatePublished - Aug 2022
Externally publishedYes


  • coplanar
  • cost function
  • energy dissipation
  • full adder
  • quantum-dot cellular automata
  • ripple carry adder


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