Patent ID: 11915781
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 3:
4. The apparatus of claim 3, wherein the ZQ calibration circuit includes:
a first pull-up replica circuit, wherein a configuration of the first pull-up replica circuit is same as a configuration of the first pull-up driver circuit, and wherein the first pull-up replica circuit is configured to perform pull-up calibration based on a first fixed code or a first sweep code;
a second pull-up replica circuit, wherein a configuration of the second pull-up replica circuit is same as a configuration of the second pull-up driver circuit, and wherein the second pull-up replica circuit is configured to perform the pull-up calibration based on a second fixed code or a second sweep code; and
a pull-down replica circuit, wherein a configuration of the pull-down replica circuit is same as a configuration of the pull-down driver circuit, and wherein the pull-down replica circuit is connected to the first pull-up replica circuit and the second pull-up replica circuit and configured to perform pull-down calibration based on a third code.