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:
Feb. 06, 1990
Filed:
Aug. 29, 1988
Richard J Petschauer, Edina, MN (US);
Robert J Bergman, Roseville, MN (US);
Unisys Corporation, Blue Bell, PA (US);
Abstract
A sense amplifier is provided for a bipolar random access memory that has memory cells arranged in a column and a pair of bit lines for said column of memory cells. A first bipolar transistor has its collector-emitter path coupled to one of the bit lines of a pair, and a base coupled through a diode means to the second bit line. A second bipolar transistor has its collector-emitter path coupled to the second bit line and its base coupled through a second diode to the first bit line. The collectors of both of the bipolar transistors are coupled to provide an output signal. Resistors are coupled to a pulse source and to both of the bases of the bipolar transistors. A current sink is coupled to both of the select bit lines. The diode means are connected so as to be forward biased when the base-emitter junction of the transistor to which the diode means is coupled is also forward biased.