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AHaH Computing–From Metastable Switches to Attractors to Machine Learning

Figure 4

A differential pair of memristors forms a synapse.

A differential pair of memristors is used to form a synaptic weight, allowing for both a sign and magnitude. The bar on the memristor is used to indicate polarity and corresponds to the lower potential end when driving the memristor into a higher conductance state. and form a voltage divider causing the voltage at node y to be some value between and . When driven correctly in the absence of Hebbian feedback a synapse will evolve to a symmetric state where V, alleviating issues arising from device inhomogeneities.

Figure 4