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. 14, 1995
Filed:
Oct. 19, 1993
Applicant:
Inventors:
Sossio Itri, Wolfsburg, DE;
Martin Rieger, Rottweil, DE;
Assignee:
Deutsche Thomson-Brandt GmbH, Villingen-Schwenningen, DE;
Primary Examiner:
Int. Cl.
CPC ...
H03F / ;
U.S. Cl.
CPC ...
330254 ; 330261 ;
Abstract
To improve the regulation (gain control) characteristics of a controllable amplifier, a negative feedback network in a differential amplifier is subdivided into individual networks supplied each with its own control current. In order to reduce distortion caused by non-linear sections contained in the networks or to increase intermodulation resistance, the individual control currents are reduced with an increasing input voltage. To obtain a dB-linear regulation characteristic the control currents may be proportioned, for example, in accordance with tangential-hyperbolic characteristic curves.