In this article, four novel approximate full-adder (AXFA) circuits based on the emerging magnetic tunnel junction (MTJ) device is proposed. The proposed magnetic FAs (MFAs) offer full nonvolatility, low area, and considerably lower energy consumption than their previous counterparts. Also, two of the proposed MFAs have the advantage of single event upset (SEU) tolerance. Simulation results reveal that the proposed designs offer over 50% energy efficiency in comparison with the considered previous fully nonvolatile MFAs. Using the proposed adders in the design of an approximate Gaussian filter, we showed that the filtered noisy images have almost the same results as the accurate Gaussian filter. The proposed MFAs have an accurate carry-out output and an approximate sum output with an error distance of 2.

中文翻译：

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用于存储器架构计算的非易失性低成本近似自旋电子全加器

在本文中，提出了四种基于新兴磁隧道结 (MTJ) 器件的新型近似全加器 (AXFA) 电路。与以前的同类产品相比，所提出的磁性 FA (MFA) 具有完全的非挥发性、小面积和低得多的能耗。此外，两个提议的 MFA 具有单事件翻转 (SEU) 容限的优势。仿真结果表明，与之前考虑的完全非易失性 MFA 相比，所提出的设计提供了超过 50% 的能源效率。在近似高斯滤波器的设计中使用建议的加法器，我们表明过滤后的噪声图像与精确高斯滤波器具有几乎相同的结果。所提出的 MFA 具有准确的进位输出和误差距离为 2 的近似总和输出。