Method of Operating an Integrated Circuit, Integrated Circuit, and Memory Module

A memory module comprising at least one integrated circuit comprising:

• a plurality of resistivity changing memory cells and at least one resistivity changing reference cell;
• a voltage comparator comprising a first input terminal and a second input terminal;
• a signal line being connected to the resistivity changing memory cells, the at least one resistivity changing reference cell, and the second input terminal;
• and
• a switching element connecting the first input terminal to the second input terminal.

A method of operating an integrated circuit, the integrated circuit comprising:

• a plurality of resistivity changing memory cells and at least one resistivity changing reference cell;
• a voltage comparator comprising a first input terminal and a second input terminal;
• a signal line being connected to the plurality of resistivity changing memory cells, the at least one resistivity changing reference cell, and the second input terminal;
• and
• a switching element connecting the first input terminal to the second input terminal, the method comprising:
• a) closing the switching element;
• b) supplying a first voltage to the first input terminal via the signal line and the switching element;
• c) opening the switching element;
• d) supplying a second voltage to the second input terminal via the signal line;
• and
• e) comparing the first voltage and the second voltage using the voltage comparator, wherein the first voltage represents a memory state of a resistivity changing memory cell, and the second voltage is a reference voltage which represents a memory state of a resistivity changing reference cell, or vice versa.