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:
Aug. 18, 2009
Filed:
Sep. 19, 2006
Chengming He, Austin, TX (US);
Richard A. Johnson, Buda, TX (US);
Alan F. Hendrickson, Austin, TX (US);
Chengming He, Austin, TX (US);
Richard A. Johnson, Buda, TX (US);
Alan F. Hendrickson, Austin, TX (US);
Silicon Laboratories, Inc., Austin, TX (US);
Abstract
According to a disclosed method, a calibration signal is provided at a first frequency corresponding to a low frequency edge of a desired passband to an input of a filter (). A first value is measured at an output of the filter (). The calibration signal is provided at a second frequency corresponding to a high frequency edge of the desired passband to the input of the filter (). A second value is measured at the output of the filter (). The first value is compared to the second value. A characteristic of the filter () is changed in response to the comparing. In one form, the filter is an IF filter () and a receiver () includes both the IF filter () and a calibration circuit () for forming the calibration signal and providing the calibration signal to the IF filter to change the characteristic in response to a calibration operation.