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

Claim 9:
10. The semiconductor device of claim 9, wherein the calibration control circuit is configured to:
perform a first calibration control operation that sets the first input signal of the comparing circuit as a voltage in the second node by the calibration current from the variable current source by providing the on-die resistor with a start value of a resistance adjustment code in a state in which switching control signals for opening the first switch, the third switch, the fifth switch, and the sixth switch and for closing the second switch and the fourth switch have been provided to the calibration circuit,
perform a second calibration control operation that sets the second input signal of the comparing circuit as a voltage in the third node by the calibration current from the variable current source in a state in which switching control signals for opening the first switch, the second switch, the third switch, and the fourth switch and for closing the fifth switch and the sixth switch have been provided to the calibration circuit, and
perform a third calibration control operation that increases a value of the resistance adjustment code when the logic level of the output signal that is transmitted by the comparing circuit is not changed, provides the increased value to the on-die resistor, and sets, as a resistance value of the on-die resistor, a resistance value corresponding to a value of the resistance adjustment code when the logic level of the output signal that is transmitted by the comparing circuit is changed.