期刊
NATURE COMMUNICATIONS
卷 12, 期 1, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/s41467-021-25455-0
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资金
- Semiconductor Research Corporation (SRC)
- NSF/SRC E2CDA grant [1740352]
- National Research Foundation of Korea [5199990814490] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The superior density of passive analog-grade memristive crossbar circuits allows for storing large neural network models on specialized neuromorphic chips to avoid costly off-chip communication. A 64x64 passive crossbar circuit with high functional nonvolatile metal-oxide memristors was successfully fabricated with low variation in memristor switching voltages. Experimental verification of analog properties demonstrated accurate modeling for MNIST image classification and large-scale multilayer perceptron classifier based on advanced conductance tuning algorithm.
The superior density of passive analog-grade memristive crossbar circuits enables storing large neural network models directly on specialized neuromorphic chips to avoid costly off-chip communication. To ensure efficient use of such circuits in neuromorphic systems, memristor variations must be substantially lower than those of active memory devices. Here we report a 64 x 64 passive crossbar circuit with -99% functional nonvolatile metal-oxide memristors. The fabrication technology is based on a foundry-compatible process with etchdown patterning and a low-temperature budget. The achieved <26% coefficient of variance in memristor switching voltages is sufficient for programming a 4K-pixel gray-scale pattern with a <4% relative tuning error on average. Analog properties are also successfully verified via experimental demonstration of a 64 x 10 vector-by-matrix multiplication with an average 1% relative conductance import accuracy to model the MNIST image classification by ex-situ trained single-layer perceptron, and modeling of a large-scale multilayer perceptron classifier based on more advanced conductance tuning algorithm.
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