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. 21, 1989
Filed:
Jul. 01, 1987
Elmer Simmons, Whitman, MA (US);
Digital Equipment Corporation, Maynard, MA (US);
Abstract
A new differential amplifier circuit including two current mode logic circuits, each comprising a pair of transistors whose emitters are connected to a common current source. The differential amplifier circuit receives three input signals, with a transistor in both of the current mode logic circuits being controlled by one of the input signals. The collector outputs of the two transistors controlled by a single input signal are connected together, and the collector outputs of the two transistors controlled by the other two input signals are also connected together, in both cases to form summing junctions. The summing junctions are connected to an output buffer to generate a pair of signals constituting differential output signals.