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. 18, 1992
Filed:
Nov. 30, 1990
Ching-Te K Chuang, South Salem, NY (US);
Denny D Tang, Pleasantville, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
High-speed low-power emitter coupled logic (ECL) and non-threshold logic (NTL) circuits are disclosed wherein an ac-coupled complementary push-pull output stage is utilized. The circuits utilize two capacitors to couple an ac-pulse derived from a replica of an input signal to the bases of the complementary PNP-NPN push-pull transistors to provide a large transient current, thus realizing high-speed operation with very low dc power dissipation. The coupling scheme allows a very low switch current to be used for the logic (current switch) stage to maintain the proper logic levels while avoiding the impact on the switching speed by the large pull-up resistors of the logic stage.