公开(公告)号：US20240096382A1

公开(公告)日：2024-03-21

申请号：US18464618

申请日：2023-09-11

Applicant: Samsung Electronics Co., Ltd.

Inventor： Tongsung KIM ,  Junghwan KWAK ,  Seungjun BAE ,  Chiweon YOON ,  Byungkwan CHUN ,  Youngmin JO

IPC: G11C7/10 ,  G06F13/16

CPC classification number: G11C7/1048 ,  G06F13/16 ,  G06F2213/16 ,  G11C2207/2254

Abstract: A ZQ calibration circuit includes: a ZQ controller configured to detect an end of one interface mode, among a plurality of interface modes in which ZQ calibration is supported, and to instruct a switch to another interface mode in response to the one interface mode coming to an end; a ZQ engine configured to generate a first reference voltage corresponding to the one interface mode through a multi-reference voltage generator, to generate a second reference voltage corresponding to the another interface mode in response to the switch to the another interface mode being instructed, to perform the ZQ calibration based on the first reference voltage or the second reference voltage, and to output a calibration code; and a ZQ driver configured to output an output signal through an input/output pad based on the calibration code.