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:
May. 25, 2004
Filed:
Mar. 22, 2002
Wataru Yokozeki, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A semiconductor memory device has a dummy bit line, a reference voltage generating circuit, a comparator circuit, and a timing signal generating circuit. The dummy bit line has a load equal to a load of a bit line, and the reference voltage generating circuit generates a reference voltage. The comparator circuit compares a potential of the dummy bit line with the reference voltage, and the timing signal generating circuit generates various kinds of timing signals based on an output of the comparator circuit. The semiconductor memory device simultaneously selects a plurality of dummy memory cells and connects the selected dummy memory cells to the dummy bit line, and adjusts the potential of the dummy bit line.