Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Kee-Teok Park0
Ki-Ho Kim0
Date of Patent
August 10, 2010
Patent Application Number
11967699
Date Filed
December 31, 2007
Patent Citations Received
Patent Primary Examiner
Patent abstract
A ZQ calibration circuit performs a ZQ calibration additionally in an initial operation of a semiconductor memory device. The ZQ calibration controller of the ZQ calibration circuit includes a first signal generator, a second signal generator, and a control unit. The first signal generator generates a pre-calibration signal during an initialization of the semiconductor memory device. The second signal generator generates ZQ calibration signals in response to a ZQ calibration command. The control unit outputs signals to control a ZQ calibration in response to the pre-calibration signal and the ZQ calibration signals.
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