Product-sum operation device, logical operation device, neuromorphic device, and product-sum operation method

A product-sum operation device comprising:

• a plurality of product operation units configured to generate output signals by multiplying input signals corresponding to input values by weighting factors and output the output signals;
• a current detection unit configured to execute a current detecting process in which a current output from the plurality of product operation units with a predetermined time delay from input of the input signal and a current output from the plurality of product operation units at a predetermined time interval thereafter are detected in a time span from a first transient response being converged to a steady state to before occurrence of a second transient response, the first transient response being due to charging to a parasitic capacitance of the product operation units by input of the input signal and the second transient response being due to discharging from the parasitic capacitance of the product operation units by input of the input signal;
• and
• a sum operation unit configured to calculate a value relating to a total sum of the output signals based on currents detected at the predetermined time intervals by the current detecting unit.