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Trading Accuracy for Power with a Configurable Approximate Adder
Toshinori SATO Tongxin YANG Tomoaki UKEZONO
IEICE TRANSACTIONS on Electronics
Publication Date: 2019/04/01
Online ISSN: 1745-1353
Type of Manuscript: Special Section PAPER (Special Section on Solid-State Circuit Design — Architecture, Circuit, Device and Design Methodology)
approximate computing, low-power circuit, approximate adder,
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Approximate computing is a promising paradigm to realize fast, small, and low power characteristics, which are essential for modern applications, such as Internet of Things (IoT) devices. This paper proposes the Carry-Predicting Adder (CPredA), an approximate adder that is scalable relative to accuracy and power consumption. The proposed CPredA improves the accuracy of a previously studied adder by performing carry prediction. Detailed simulations reveal that, compared to the existing approximate adder, accuracy is improved by approximately 50% with comparable energy efficiency. Two application-level evaluations demonstrate that the proposed approximate adder is sufficiently accurate for practical use.