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Nanoscale resistive memory devices are expected to fuel dense integration of electronic synapses for large-scale neuromorphic systems. To realize such a brain-inspired computing chip, a compact CMOS spiking neuron that performs in situ learning and computing while driving a large number of resistive synapses is desired. This brief presents a novel leaky integrate-and-fire neuron design that implements the dual-mode operation of current integration and synaptic drive, with a single operational amplifier (opamp) and enables in situ learning with crossbar resistive synapses. The proposed design was implemented in a 0.18-&#x03BC;m CMOS technology. Measurements show neuron's ability to drive a thousand resistive synapses and demonstrate in situ associative learning. The neuron circuit occupies a small area of 0.01 mm<sup>2</sup> and has an energy efficiency value of 9.3 pJ/spike/synapse.

A CMOS Spiking Neuron for Brain-Inspired Neural Networks With Resistive Synapses and In Situ Learning