Fig. 3

Synaptic operation of the alloyed memristor. (a) A synapse increases its weight/conductance (red) with each positive input pulse (Potentiation). A negative input pulse will decrease its weight/conductance (Depression). (b) Setup and input pulse for demonstrating the nonvolatile synaptic operation of the memristor. (c) 100 positive input pulses followed by 100 negative input pulses are sent from the source (black). After each pulse, a read signal with 0.1 V amplitude is applied (zoom-in). Following an initial fast turn on, the on-state conductance of the memristor is changed as can be seen by the current through the device (red). (d) Mean conductance levels during the read pulse of the input signal shown for five measurements. The calculated mean is shown in red. (e) The difference of the measured conductance \(\:{G}_{measured}\) from the mean calculated conductance \(\:{G}_{mean}\). The plot shows the difference of all five operation with 100 points each. One can see a high repeatability of the synaptic weight measurement for both potentiation and depression.