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:
Aug. 25, 1992
Filed:
Apr. 12, 1991
Stephane Barbu, Caen, FR;
U.S. Philips Corporation, New York, NY (US);
Abstract
A power-amplifier cell which comprises an inverting input amplifier made up of a first transistor (T.sub.1) having a collector connected to a first supply-voltage terminal via a first resistor (R.sub.11), and an output stage comprising a second (T.sub.4) and a third (T.sub.6) transistor whose collector-emitter paths are arranged in series. The common point between the second and third transistors forms an output (5) of the power amplifier. The second transistor (T.sub.4) has its base connected to the collector of the first transistor (T.sub.1) and a control signal is applied to the base of the third transistor (T.sub.6) via a second resistor (R.sub.16). Furthermore, a first capacitor (C.sub.1) is arranged in parallel with the first resistor (R.sub.11) and the control signal is the input signal (E) or a fraction thereof. The power amplifier may comprise two cells whose first transistors (T.sub.1) have their emitters coupled to one another.