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:
Jun. 19, 2012
Filed:
Jun. 23, 2010
Nobukazu Murata, Tokyo, JP;
Nobukazu Murata, Tokyo, JP;
Oki Semiconductor Co., Ltd., Tokyo, JP;
Abstract
The present invention provides a readout circuit including: a memory cell array that includes a readout target memory cell that is a data readout target; a reference memory cell having the same configuration as this memory cell; a first constant current source and a second constant current source which have the same characteristics; and a reference current source that generates, as a reference current for determining the logic level of the readout target memory cell, a current obtained by adding one constant current, out of a first constant current flowing through the first constant current source or a second constant current flowing through the second constant current source, with a reference memory cell current flowing in the reference memory cell, and by subtracting the other constant current, out of the first constant current or the second constant current, from the added current.