Frequency Response to AC Input Signal in a Neuristor

The frequency response of a single transistor-based artificial neuron, termed a neuristor, is studied. In contrast to the previously reported spiking properties with direct current ( ${I}_{\text {DC}}$ ) input, the oscillating and spiking properties with alternating current ( ${I}_{\text {AC}}$ ) inputs at different frequencies ( ${f}_{\text {AC}}$ ) are investigated to more realistically mimic neuronal operation in a biological neuron. Without requiring an extra circuit, the neuristor responds to ${f}_{\text {AC}}$ lower than the intrinsic threshold frequency ( ${f}_{\text {th}}$ ). Because this ${f}_{\text {th}}$ is modulated by applying gate voltage to the neuristor, its energy efficiency can be further improved.