US 12,394,452 B2
ZQ calibration circuit for multiple interfaces
Tongsung Kim, Suwon-si (KR); Junghwan Kwak, Suwon-si (KR); Seungjun Bae, Suwon-si (KR); Chiweon Yoon, Suwon-si (KR); Byungkwan Chun, Suwon-si (KR); and Youngmin Jo, Suwon-si (KR)
Assigned to Samsung Electronics Co., Ltd., Gyeonggi-Do (KR)
Filed by Samsung Electronics Co., Ltd., Suwon-si (KR)
Filed on Sep. 11, 2023, as Appl. No. 18/464,618.
Claims priority of application No. 10-2022-0118211 (KR), filed on Sep. 19, 2022; and application No. 10-2022-0168967 (KR), filed on Dec. 6, 2022.
Prior Publication US 2024/0096382 A1, Mar. 21, 2024
Int. Cl. H03K 19/00 (2006.01); G06F 13/16 (2006.01); G11C 7/10 (2006.01); H04L 25/02 (2006.01)
CPC G11C 7/1048 (2013.01) [G06F 13/16 (2013.01); G06F 2213/16 (2013.01); G11C 2207/2254 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A ZQ calibration circuit comprising:
a ZQ controller configured to detect an end of one interface mode from 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.