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Approximate Adder Segmentation Technique and Significance-Driven Error Correction

Lookup NU author(s): Khaled Al-ma''aitah, Dr Ghaith Tarawneh, Dr Ahmed Abd El-Aal, Issa Qiqieh, Professor Alex Yakovlev

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This is the authors' accepted manuscript of a conference proceedings (inc. abstract) that has been published in its final definitive form by IEEE, 2017.

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Abstract

Approximate computing introduces a new era of low-power and high-speed circuit designs. Instead of strictaccurate computation, relaxed requirements might increase performance and reduce power consumption with a simplified or inaccurate circuit. One of the recent remarkable research efforts is the accuracy-configurable approximate adder designs, which can gracefully operate in both approximate (inaccurate) and accurate modes. In this paper, a novel technique for segmenting approximate adders was proposed by adding new bit locations that exploit the carry kill signal definition to limit carry propagation at specific locations. Moreover, a light- weight carry-in prediction and error detection techniques were proposed. For error recovery circuit, a significance-driven configurable correction stages were implemented, which imply a fast convergence to exact outputs with a very low magnitude of errors. The proposed design showed improvements of (16%) and (18.6%) for dynamic power and area respectively. Nevertheless, outputs reserved a general high accuracy level, which limited between 99% and 100% for the majority of input space. The proposed design was implemented in an image filter application, which resulted in high PSNR values of (53 and 83 db) for the two premier correction stages, and 100% exact results for the highest accuracy mode.


Publication metadata

Author(s): Al-Maaitah K, Tarawneh G, Soltan A, Qiqieh I, Yakovlev A

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: 27th International Symposium on Power And Timing Modeling, Optimization and Simulation (PATMOS)

Year of Conference: 2017

Online publication date: 16/11/2017

Acceptance date: 02/04/2016

Publisher: IEEE

URL: https://doi.org/10.1109/PATMOS.2017.8106986

DOI: 10.1109/PATMOS.2017.8106986

Library holdings: Search Newcastle University Library for this item

ISBN: 9781509064625


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