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. 21, 2004
Filed:
Nov. 29, 2001
Andreas Wichern, Hamburg, DE;
Niels Gabriel, Hamburg, DE;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
A gain-controlled amplifier comprises two signal output stages arranged in parallel to drive an output load in series. A maximum-gain stage provides a maximum of signal gain and the other minimum-gain stage fixes the minimum overall amplifier signal gain. Gain-control input signals differentially applied to the two such stages balance the contributions of the respective gain stages delivered to the common output load. In one aspect, a third shunting transistor is used across the minimum-gain stage. In another version, the output load is a tapped resistor and the respective maximum and minimum gain stages drive different taps.