公开(公告)号：US11502687B2

公开(公告)日：2022-11-15

申请号：US17389148

申请日：2021-07-29

Applicant: Samsung Electronics Co., Ltd.

Inventor： Tongsung Kim ,  Youngmin Jo ,  Jungjune Park ,  Jindo Byun ,  Dongho Shin ,  Jeongdon Ihm

IPC: H03K19/00 ,  H03K19/0185 ,  G11C7/10 ,  G11C8/10 ,  H03K19/08

Abstract: An impedance calibration circuit includes a first code generation circuit connected to a first reference resistor, and configured to generate a first code for forming a resistance based on the first reference resistor, by using the first reference resistor; a second code generation circuit configured to form a resistance of a second reference resistor less than the resistance of the first reference resistor, based on the first code, and generate a second code by using the second reference resistor; and a target impedance code generation circuit configured to generate a target impedance code based on the first code, the second code, and a target impedance value, and form an impedance having the target impedance value in a termination driver connected to the impedance calibration circuit, based on the target impedance code.