| US 7,580,483 B2 | ||
| Trimming of local oscillation in an integrated circuit radio | ||
| Brima B. Ibrahim, Aliso Viejo, Calif. (US); and Henrik T. Jensen, Long Beach, Calif. (US) | ||
| Assigned to Broadcom Corporation, Irvine, Calif. (US) | ||
| Filed on Sep. 05, 2006, as Appl. No. 11/516,413. | ||
| Application 11/516413 is a continuation of application No. 10/243861, filed on Sep. 13, 2002, granted, now 7,116,729. | ||
| Application 10/243861 is a continuation in part of application No. 10/134797, filed on Apr. 29, 2002, granted, now 7,079,595. | ||
| Prior Publication US 2007/0002974 A1, Jan. 04, 2007 | ||
| Int. Cl. H04L 27/14 (2006.01); H04L 27/16 (2006.01); H04L 27/22 (2006.01) | ||
| U.S. Cl. 375—326 [375/327; 375/325; 375/376; 375/344; 455/302; 455/340] | 10 Claims |
| 1. A method comprising:
mixing, by a mixer, a received radio signal with a local oscillation signal to produce a demodulated signal;
determining a DC offset from the demodulated signal, wherein the DC offset is determined by finding a midpoint value between
an average peak value and an average valley value of the demodulated signal and referenced to a zero amplitude level;
determining if magnitude of the DC offset exceeds an upper limit of an allowable offset threshold or lower limit of the allowable
offset threshold; and
adjusting the local oscillation signal to reduce the DC offset to the zero amplitude level, when the magnitude of the DC offset
exceeds the upper limit or the lower limit of the allowable offset threshold.
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