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:
Sep. 11, 1990
Filed:
Apr. 12, 1989
Johannes P Bahlmann, Eindhoven, NL;
U.S. Philips Corp., New York, NY (US);
Abstract
A transistor output stage including an output transistor having its base coupled to the emitter of a driver transistor is driven into saturation by a current source which is connected to the base of the driver transistor. When a small output current is flowing through the load connected to the collector of the output transistor, the surplus of the current from the current source is drained from the base of the driver transistor to the collector of the output transistor via the collector-emitter path of a limiting transistor having its base connected to the base of the output transistor. This reduces the power dissipation in the driver transistor and improves the power efficiency of the transistor output stage.