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:
Jul. 04, 1989
Filed:
Jun. 24, 1988
Kazuo Watanabe, Kanagawa, JP;
Masatoshi Yano, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
A memory circuit incorporates a plurality of memory cells arranged in matrix form, with a data line drive circuit having an active load circuit including two MOS transistors, operating as resistive elements during writing, and connected to the data line and the inverted data line of the cells. A differential amplifier is connected to the data line and inverted data line, and a plurality of constant current sources are connected to the transistors of the differential amplifier, with switching means causing one constant current source to be nonconductive during a write operation, with at least one of the current sources being normally on during reading and writing.