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:
Mar. 11, 2008
Filed:
Jan. 15, 2004
Joichiro Ezaki, Chuo-ku, JP;
Yuji Kakinuma, Chuo-ku, JP;
Keiji Koga, Chuo-ku, JP;
Shigekazu Sumita, Chuo-ku, JP;
Joichiro Ezaki, Chuo-ku, JP;
Yuji Kakinuma, Chuo-ku, JP;
Keiji Koga, Chuo-ku, JP;
Shigekazu Sumita, Chuo-ku, JP;
TDK Corporation, Tokyo, JP;
Abstract
The number of write circuit components, variations in a write current flowing through each write line, and the power consumption for write operation can be reduced. A first constant current circuit and a second constant current circuit (a transistor (Q) and a resistor (R), and a transistor (Q) and a resistor (R)) are shared among a plurality of current direction control portions (−1,+1, . . . ). The constant current circuits are connected to each current direction control portion () through a first circuit selector switch (SW. . . , SW, SW+1, . . . ) and a second circuit selector switch (SW. . . , SW, SW+1, . . . ) disposed for each current direction control portion (). Moreover, a decode signal voltage is applied to the constant current circuits from a word decode line (X) (bit decode line (Y)) through the circuit selector switches (SW) and (SW).