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:
Jun. 01, 1993
Filed:
Apr. 23, 1992
Teunis H Uittenbogaard, Nijmegen, NL;
Louis Praamsma, Nijmegen, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
A controllable amplifier circuit includes, successively, in a cascode arrangement between a power supply voltage and ground, a control transistor and a field effect amplifier transistor having a control input for applying a gain control signal thereto and a gate input for applying an input signal thereto, respectively, via which control transistor the field effect amplifier transistor supplies an output signal to a signal output of the controllable amplifier circuit. The control transistor varies the working point of the field effect amplifier transistor in the ohmic range in dependence upon the gain control signal, at least in a part of the control range of the gain control signal. The circuit can be used with a low power supply voltage because the controllable amplifier circuit includes a controllable bias circuit which is coupled to the gate input of the field effect amplifier transistor for applying a controllable bias voltage thereto. This voltage varies in the opposite direction to the gain control signal mainly in said part of the control range.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile