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Xue, Cheng-Xin; Chang, Ting-Wei; Chang, Tung-Cheng; Kao, Hui-Yao; Chiu, Yen-Cheng; Lee, Chun-Ying; King, Ya-Chin; Lin, Chrong-Jung; Liu, Ren-Shuo; Hsieh, Chih-Cheng; Tang, Kea-Tiong; Chen, Wei-Hao; Chang, Meng-Fan; Liu, Je-Syu; Li, Jia-Fang; Lin, Wei-Yu; Lin, Wei-En; Wang, Jing-Hong; Wei, Wei-Chen; Huang, Tsung-Yuan
IEEE journal of solid-state circuits, 2020-Jan., 2020-1-00, 20200101, Volume: 55, Issue: 1Journal Article
Computing-in-memory (CIM) based on embedded nonvolatile memory is a promising candidate for energy-efficient multiply-and-accumulate (MAC) operations in artificial intelligence (AI) edge devices. However, circuit design for NVM-based CIM (nvCIM) imposes a number of challenges, including an arealatency-energy tradeoff for multibit MAC operations, patterndependent degradation in signal margin, and small read margin. To overcome these challenges, this article proposes the following: 1) a serial-input non-weighted product (SINWP) structure; 2) a down-scaling weighted current translator (DSWCT) and positive-negative current-subtractor (PN-ISUB); 3) a currentaware bitline clamper (CABLC) scheme; and 4) a triple-margin small-offset current-mode sense amplifier (TMCSA). A 55-nm 1-Mb ReRAM-CIM macro was fabricated to demonstrate the MAC operation of 2-b-input, 3-b-weight with 4-b-out. This nvCIM macro achieved T MAC = 14.6 ns at 4-b-out with peak energy efficiency of 53.17 TOPS/W.
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