Multiplication device, multiply-accumulate operation device, matrix operation device, and reservoir device

Abstract

A multiplication device according to one embodiment includes a short-term memory circuit, a long-term memory circuit, a conversion circuit, and a control circuit. The short-term memory circuit generates a first control voltage in accordance with a weight value. The long-term memory circuit generates a second control voltage by a circuit with a larger time constant than the short-term memory circuit. The conversion circuit outputs an output current by multiplying an input voltage by a conductance. The output current is output by that, the first control voltage is applied to a control terminal of the conversion circuit, and an input voltage according to an input value is applied to an input terminal of the conversion circuit. The control circuit executes a calibration process of matching the first control voltage with the second control voltage by transferring an electric charge from the long-term memory circuit to the short-term memory circuit.