Memristive dot product engine with a nulling amplifier

A method of obtaining a dot product using a memristive dot product engine with a nulling amplifier, the method comprising:

• applying a number of programming voltages to a number of row lines within a memristive crossbar array to change the resistance values of a corresponding number of memristors located at intersections between the row lines and a number of column lines;
• applying a number of reference voltages to the number of the row lines;
• applying a number of operating voltages to the number of the row lines, the operating voltages representing a corresponding number of vector values;
• determining an array output based on a reference output and an operating output collected from the number of column lines.

A computing device for determining a dot product using a memristive crossbar array with a nulling amplifier, comprising:

• a processor;
• and
• a memristive crossbar array coupled to the processor, the memristive crossbar array comprising:
• a number of row lines;
• a number of column lines intersecting the row lines, a memristive memory element located at each intersection of a row line and a column line, in which each memristive element receives:
• a programming vector signal to represent a value within a matrix;
• a reference vector signal;
• and
• an operating vector signal to represent a vector value to be multiplied by the matrix;
• and
• a nulling amplifier to:
• determine a reference output along each column line based on a number of reference vector signals;
• determine an operating output along each column line based on a number of operating vector signals;
• and
• determine an array output by subtracting the reference output from the operating output.