US 12,237,044 B2
Impedance calibration circuit, memory controller including the impedance calibration circuit and memory system including the memory controller
In Soo Lee, Icheon-si (KR)
Assigned to SK hynix Inc., Icheon-si (KR)
Filed by SK hynix Inc., Icheon-si (KR)
Filed on Mar. 20, 2023, as Appl. No. 18/186,708.
Claims priority of application No. 10-2022-0141441 (KR), filed on Oct. 28, 2022.
Prior Publication US 2024/0144981 A1, May 2, 2024
Int. Cl. G11C 7/00 (2006.01); G11C 7/10 (2006.01); H03K 19/00 (2006.01)
CPC G11C 7/1048 (2013.01) [H03K 19/0005 (2013.01); G11C 2207/2254 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An impedance calibration circuit comprising:
a first impedance calibration part configured to perform a first impedance calibration operation of generating a first impedance calibration code set for adjusting an impedance of a first terminating resistor to a first target value, with reference to an external resistor having a first resistance value; and
a second impedance calibration part configured to perform a second impedance calibration operation of generating a second impedance calibration code set for adjusting an impedance of a second terminating resistor to a second target value, with reference to a reference resistance unit, a resistance value of which is set to a second resistance value according to a part of the first impedance calibration code set.