SAMA: Self-adjusting multi-cycle approximate adder. (April 2023)

• Record Type: Journal Article
• Authors: Baratalipour, Elahe; Kamran, Arezoo
• Is Part Of: Microelectronics journal. Volume 134(2023)
• Publication Date: 2023-04
• Subjects: Approximate adders -- Approximate computing -- Power-delay product -- Energy-delay product -- Approximate image processing -- Mean-squares prediction; Microelectronics -- Periodicals; Microélectronique -- Périodiques; Microelectronics; Electronic journals; Journals - contents and abstracts; Periodicals; 621.3805
• DOI: 10.1016/j.mejo.2023.105740
• Languages: English
• ISSNs: 0959-8324

Abstract

Abstract: Approximate computing is a promising approach that leads to a better compromise between power and delay by trading an acceptable level of accuracy in inherently error resilient applications. In this paper, we present a runtime accuracy configurable approximate adder that can operate in both approximate and exact modes. It provides a better compromise between power, delay, and accuracy compared with state-of-the-art approximate adders at high accuracies. Our evaluations show that the proposed adder can make up to 45% and 79% improvements in power-delay product (PDP) and energy-delay product (EDP), respectively, compared with state-of-the-art approximate adders, at high accuracies. In the accurate mode, the improvements in the PDP and EDP are up to 58% and 82%, respectively. The use of the proposed adder in an image processing application and in a mean-squares prediction algorithm confirms its superiority over existing circuits in terms of PDP and EDP.