| US 7,577,413 B2 | ||
| Method and apparatus for calibrating a filter of a receiver | ||
| Chengming He, Austin, Tex. (US); Richard A. Johnson, Buda, Tex. (US); and Alan F. Hendrickson, Austin, Tex. (US) | ||
| Assigned to Silicon Laboratories, Inc., Austin, Tex. (US) | ||
| Filed on Sep. 19, 2006, as Appl. No. 11/523,440. | ||
| Prior Publication US 2008/0070539 A1, Mar. 20, 2008 | ||
| Int. Cl. H04B 17/00 (2006.01); H04B 1/06 (2006.01) | ||
| U.S. Cl. 455—226.1 [455/266; 455/339] | 20 Claims |
| 1. A method comprising:
providing a calibration signal at a first frequency corresponding to a low frequency edge of a desired passband to an input
of a filter;
measuring a first value at an output of the filter;
providing the calibration signal at a second frequency corresponding to a high frequency edge of the desired passband to the
input of the filter;
measuring a second value at the output of the filter;
comparing the first value to the second value; and
changing a characteristic of the filter in response to the comparing.
|