Multiply and accumulate calculation device, neuromorphic device, and multiply and accumulate calculation method

A multiply and accumulate calculation device comprising:

• a variable resistor array unit having a plurality of variable resistance elements;
• a first reference array unit including a reference column having a reference resistance element having a fixed resistance value;
• a second reference array unit including a reference row having a reference resistance element having a fixed resistance value;
• a first signal input unit connected to an input side of the variable resistor array unit, and configured to generate a first input signal from input data, and input the first input signal to the plurality of variable resistance elements and the reference resistance elements of the reference column;
• a first detection unit connected to an output side of the variable resistor array unit, and configured to detect a current flowing through the variable resistor array unit, based on the first input signal applied to the plurality of variable resistance elements;
• a second detection unit connected to the output side of the variable resistor array unit, and configured to detect a current flowing through the first reference array unit, based on the first input signal applied to the reference resistance elements of the reference column;
• a second signal input unit connected to the output side of the variable resistor array unit, and configured to generate a second input signal from input data, and input the second input signal to the plurality of variable resistance elements and the reference resistance elements of the reference row;
• a third detection unit connected to the input side of the variable resistor array unit, and configured to detect a current flowing through the variable resistor array unit, based on the second input signal applied to the plurality of variable resistance elements;
• a fourth detection unit connected to the input side of the variable resistor array unit, and configured to detect a current flowing through the second reference array unit, based on the second input signal applied to the reference resistance elements of the reference row;
• a first correction calculation unit configured to perform a predetermined calculation on the output from the first detection unit, based on the output from the second detection unit;
• a second correction calculation unit configured to perform a predetermined calculation on the output from the third detection unit, based on the output from the fourth detection unit;
• a first input/output switching unit connected to the input side of the variable resistor array unit, and configured to switch between an input from the first signal input unit and an output to the third detection unit;
• and
• a second input/output switching unit connected to the output side of the variable resistor array unit, and configured to switch between an input from the second signal input unit and an output to the first detection unit.

A multiply and accumulate calculation method comprising:

• an input step of generating an input signal from input data, inputting the input signal to a plurality of variable resistance elements constituting a variable resistor array unit, and outputting the input signal to a reference resistance element having a fixed resistance value and constituting a reference array unit;
• a detection step of detecting a current flowing through the variable resistor array unit, based on the input signals applied to the plurality of variable resistance elements, and detecting a current flowing through the reference array unit, based on the input signal applied to the reference resistance elements;
• and
• a correction calculation step of performing a predetermined calculation on an output according to a detection result of the current flowing through the variable resistor array unit, based on the output according to a detection result of the current flowing through the reference array unit.