The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 10, 2015
Filed:
Feb. 11, 2014
Applicant:
SK Hynix Inc., Icheon-si Gyeonggi-do, KR;
Inventor:
Hyun Sik Jeong, Seoul, KR;
Assignee:
SK Hynix Inc., Gyeonggi-do, KR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03K 17/16 (2006.01); H03K 19/003 (2006.01); H03K 19/00 (2006.01); G11C 29/02 (2006.01); H04L 25/00 (2006.01); G11C 29/50 (2006.01);
U.S. Cl.
CPC ...
H03K 19/0005 (2013.01); G11C 29/022 (2013.01); G11C 29/028 (2013.01); H04L 25/00 (2013.01); G11C 29/50008 (2013.01);
Abstract
Impedance calibration circuits are provided. The impedance calibration circuit includes an operation control signal generator and an impedance calibrator. The operation control signal generator receives temperature code signals to generate an operation control signal enabled when an internal temperature is changed from a first temperature to a second temperature. The impedance calibrator receives an external command signal or the operation control signal to generate pull-up code signals for pulling up an output signal and pull-down code signals for pulling down the output signal according to an external resistor.