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. 07, 2004
Filed:
Aug. 09, 2002
Thomas Keller, Freising, DE;
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
The invention relates to a voltage-controlled oscillator circuit including an oscillator circuit connected to a voltage source furnishing a substantially constant supply voltage, and comprising at least one varactor, and a control voltage generator circuit whose output is connected to the anode of the varactor, the frequency of the oscillation signal of the oscillator circuit being variable by changing the control voltage. A voltage converter circuit and an ON/OFF switch therefor is located between the voltage source and the oscillator circuit, the conversion factor of the voltage converter circuit being selected so that a wide tuning range of the varactor and thus a wide frequency range of the oscillation signal is available. The invention can be put to use, for example, in a phase-locked loop. The oscillator circuit may be powered by a fixed predefined battery voltage.