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:
May. 24, 1994
Filed:
Mar. 26, 1993
Applicant:
Inventor:
Petre Popescu, Kanata, CA;
Assignee:
Northern Telecom Limited, Montreal, CA;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03K / ; H03K / ;
U.S. Cl.
CPC ...
307455 ; 307443 ;
Abstract
A differential ECL (emitter coupled logic) circuit, with differential inputs and output and no series gates, comprises a plurality of transistor pairs. The differential ECL circuit can operate at high speed as there are no series gates and its noise margin is large because of differential operation. The differential circuit can be implemented into various logic circuits such as XOR (exclusive OR)/NXOR, OR/NOR, AND/NAND.