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:
Nov. 27, 2007
Filed:
Dec. 09, 2005
Giuseppe LI Puma, Bochum, DE;
Duyen Pham-stäbner, Ratingen, DE;
Georg Stabner, Ratingen, DE;
Infineon Technologies AG, Munich, DE;
Abstract
A VCO circuit () has a coil () and, in parallel therewith, a constant capacitance () and adjustable capacitance elements (). A first capacitance element () is formed by one or more varactors whose capacitance can be adjusted by an analogue adjusting voltage (V), while a second capacitance element () is formed by an arrangement comprising a plurality of capacitors which can be actuated by a digital bit word VCWD[N:1]. Digital calibration for the VCO () is performed by determining whether the present adjusting voltage is within a particular voltage range and, if this is not the case, the digital bit word being incremented or decremented by a bit value.