International Conference on Solid State Devices and Materials

We experimentally validated a Multi-Level-Cell (MLC) programming strategy in OxRAM+OTS 1S1R devices. Up to 5-level experimental encoding capabilities per device are demonstrated on 80nm cells, thanks to both 1S1R RESET voltages and SET currents engineering. Moreover, the ability to satisfactory perform a 1S1R MLC read operation is validated, promising a stable read current margin of ~2 decades during 10^9 cycles. Furthermore, the 1S1R MLC pertinence for dense hardware implementation of the synaptic weights of Quantized Recurrent Spiking Neural Networks (QRSNN) for Keyword Spotting (KWS) speech recognition task is demonstrated.