Abstract
In hardware neural networks (HNNs), different operating temperatures cause variation in conductance of resistive arrays, and they can significantly distort the information of the synaptic weights, leading to a considerable loss in pattern recognition accuracy. In this study, a WOx–based resistive device is characterized with varying ambient temperatures, and 1k-bit synapse arrays are evaluated. A systematic analysis of the impact of operating temperature on the array-based HNNs is executed using neural network simulations. Moreover, we propose a temperature compensator (TC) that can mitigate anomalous array behavior without modifying the readout circuitry. Our results have demonstrated successful accuracy recovery of the array-based HNN over a wide range of operating temperatures.
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