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:
Aug. 25, 2015
Filed:
Aug. 22, 2014
Samsung Electronics Co., Ltd., Suwon-si, KR;
Hoon Lee, Seoul, KR;
Jin-Hee Park, Seoul, KR;
SAMSUNG ELECTRONICS CO., LTD., Gyeonggi-do, KR;
Abstract
Provided is a semiconductor memory device calibrating a termination resistance, the semiconductor memory device comprising self-adjustment logic configured to determine whether a value of an upper bit string of a calibration code generated in response to a calibration start signal is equal to or greater than an upper critical value of the calibration code, or is equal to or less than a lower critical value of the calibration code, and to generate an adjustment signal for adjusting a value of a termination resistance of a data output driver based on the determination result; and resistance calibration logic configured to provide the upper bit string to the self-adjustment logic, and to generate an updated calibration code by performing a calibration calculation based on the calibration code and a comparison signal generated according to a result of comparing a reference voltage and a voltage of a comparison target node.