Reducing column switch resistance errors in RRAM-based crossbar array circuits

A method comprising:

• preparing an input signal to an apparatus, wherein the apparatus comprises:
• a crossbar array comprising a row wire, a column wire, and a cross-point device connected between the row wire and the column wire;
• a column switch having a column switch input and a column switch output, connected to the cross-point device;
• an Op-amp device having a non-inverting input, an inverting input, and an Op-amp output;
• a three-terminal switch having a first terminal, a second terminal, and a third terminal, wherein the three-terminal switch connected to the inverting input, is configured to switch between the column switch input and the column switch output;
• and
• a load resistor connected between the column switch output and the Op-amp output;
• opening the first terminal and closing the second terminal;
• calculating Vout1 of the apparatus and storing Vout1 in a memory unit;
• closing the first terminal and opening the second terminal;
• calculating Vout2 of the apparatus and storing Vout2 in the memory unit;
• using Verror=−[(Vwl−VREF)/(Rcell)]*Rcolsw;
• subtracting Verror from Vout1;
• and
• obtaining Vfinal=VREF−[(Vwl−VREF)/Rcell]*Rt.

A non-transitory computer readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by a computing system with one or more processors, cause the computing system to execute a method of:

• preparing an input signal to an apparatus, wherein the apparatus comprises:
• a crossbar array comprising a row wire, a column wire, and a cross-point device connected between the row wire and the column wire;
• a column switch having a column switch input and a column switch output, connected to the cross-point device;
• an Op-amp device having a non-inverting input, an inverting input, and an Op-amp output;
• a three-terminal switch having a first terminal, a second terminal, and a third terminal, wherein the three-terminal switch connected to the inverting input, is configured to switch between the column switch input and the column switch output;
• and
• a load resistor connected between the column switch output and the Op-amp output;
• opening the first terminal and closing the second terminal;
• calculating Vout1 of the apparatus and storing Vout1 in a memory unit;
• closing the first terminal and opening the second terminal;
• calculating Vout2 of the apparatus and storing Vout2 in the memory unit;
• using Verror=−[(Vwl−VREF)/(Rcell)]*Rcolsw;
• subtracting Verror from Vout1;
• and
• obtaining Vfinal=VREF−[(Vwl−VREF)/Rcell]*Rt.