Reservoir computer

A reservoir computer comprising:

• a reservoir unit provided with a plurality of neuron circuits;
• and
• an output layer, wherein
• each of the neuron circuits includes a plurality of inputs, an analog output, and a digital output,
• each of the plurality of inputs is supplied with the analog output of any one of other neuron circuits, the analog output of the neuron circuit itself, or an analog input signal from the outside,
• the neuron circuit includes a capacitor circuit, an amplifier, a capacitor memory circuit, a buffer circuit, and an analog-to-digital conversion circuit,
• the capacitor circuit includes a plurality of capacitors between the plurality of inputs and a single output, performs a product-sum calculation on analog signals supplied to the plurality of inputs together with the amplifier, and performs a non-linear calculation on a result of the product-sum calculation by using saturation characteristics of the amplifier,
• the capacitor memory circuit has two lanes, each lane including a capacitor for storing and a switch,
• each of the lanes is capable of sampling a result of the non-linear calculation output from the amplifier, storing the result as an electric charge in the capacitor for storing, and supplying a voltage to the buffer circuit based on the stored electric charge,
• the capacitor memory circuit alternately switches roles of the sampling and voltage supply of the two lanes,
• the output of the buffer circuit is the analog output of the neuron circuit,
• the analog-to-digital conversion circuit performs an analog-to-digital conversion on the output of the buffer circuit, and a result of the analog-to-digital conversion is the digital output of the neuron circuit, and
• the digital output is input to the output layer, and the output layer outputs a calculation result.