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. 17, 1987
Filed:
Nov. 23, 1984
Richard D Kimmel, Wappingers Falls, NY (US);
Ronald W Knepper, Lagrangeville, NY (US);
Richard Levi, Coral Springs, FL (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A read only memory utilizing a two-level cascoded current steering approach feeding a two-level common base isolation and sense amplifier network. The isolation network allows formation of a multi-way collector dot without deleterious effect upon the high speed current sensing operation. Single transistor cells with a common subcollector bed and common base rails as word lines make up the highly dense high speed array. The current source is provided by a current mirror circuit. The common-base, low impedance sense amplifier converts the sense current signal into a voltage swing which is then fed to the off-chip driver circuit via an emitter-follower pre-driver stage.