Patent ID: 11955943
Assignee: SK HYNIX INC.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 12:
13. A method of calibrating an on-die resistor of a semiconductor device in which the on-die resistor and a calibration circuit configured to perform calibration on the on-die resistor are integrated in a single chip form, the method comprising:
setting a calibration current within the calibration circuit;
performing a first calibration process that sets a first input voltage that is applied to the on-die resistor by the calibration current;
performing a second calibration process that sets a second input voltage that is applied to an external resistor having a target resistance value of the on-die resistor by the calibration current; and
performing a third calibration process that compares the first input voltage with the second input voltage and stores a resistance value of the on-die resistor when the first input voltage is higher than the second input voltage,
wherein the setting of the calibration current comprises:
providing a current adjustment code to a variable current source of the calibration circuit so that a current having a rate corresponding to a value of the current adjustment code is supplied by the variable current source; and
comparing a first voltage that is set with a second voltage that is applied to the external resistor by the current corresponding to the value of the current adjustment code, and setting, as the calibration current, the current having the rate corresponding to the value of the current adjustment code when voltage levels of the first voltage and the second voltage are close to each other.