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. 26, 1981
Filed:
Oct. 19, 1979
Michael P Bafaro, Park Ridge, IL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
An improved video amplifier arrangement with wideband D-C gain control is disclosed for use in a video display device of the type for displaying character information. The video amplifier includes an open-collector, TTL logic gate for receiving digital voice signal information which is then coupled to a cascode amplifier circuit for amplifying the video information and applying the same to a control element of an associated cathode ray tube. A D-C amplifier is provided having an adjustable element in its base input for applying a selectable D-C voltage thereto. The D-C amplifier includes an emitter resistor which is also connected to the open collector of the logic gate whereby the current developed by the D-C amplifier and applied to the emitter load resistor further determines the load current through the TTL logic gate. This, in turn, controls the level of pulse amplitude of the digital video information and serves as a video gain or level control.