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:
Jan. 25, 2005
Filed:
Mar. 22, 2001
Andreas Hofmann, Oberhaching, DE;
Andreas Hofmann, Oberhaching, DE;
Infineon Technologies AG, Munich, DE;
Abstract
A circuit configuration having a filter, for example a bandpass filter, and a method for its operation are specified, which the circuit configuration allows for compensation of a frequency error, for example between an actual mid-frequency and a nominal frequency. A first mixer, upstream of the filter and a second mixer downstream from the filter are provided. A signal and a respective oscillation frequency are each supplied to respective inputs of the first and second mixers. The oscillation frequencies are mixed as a function of the frequency error in frequency generators such that the signal at the intermediate frequency is matched to the filter characteristics of the filter which is subject to tolerances. In consequence, filters that satisfy the stringent requirements for WCDMA mobile radio applications, but by virtue of the manufacturing technique, have an excessive mid-frequency error, can be used, for example, in heterodyne receivers.