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. 20, 1994
Filed:
Jan. 29, 1993
Jean-Charles Grasset, Fontaine, FR;
Thomson-CSF Semiconducteurs Specifiques, Puteaux, FR;
Abstract
The disclosure relates to amplifiers using emitter follower type transistors and, more particularly, to means for the biasing of these emitter followers. The amplifier includes a follower transistor, a biasing circuit injecting a base biasing current into the base of the follower transistor, a current generator connecting the emitter of the follower transistor to a supply potential. According to one characteristic, the biasing circuit includes, firstly, a transistor called an image transistor, the emitter of which is connected to the emitter of the follower transistor and, secondly, a current injector for the injection, into the base of the follower transistor, of a current constituting a replica of the base current of the image transistor. One of the advantages of this arrangement is that it can be used to obtain the biasing circuit with transistors that are all of a same type, NPN or PNP, as the follower transistor.