| US 7,548,742 B2 | ||
| Tuner for radio frequency receivers and associated method | ||
| Richard A. Johnson, Buda, Tex. (US) | ||
| Assigned to Silicon Laboratories, Inc., Austin, Tex. (US) | ||
| Filed on Feb. 23, 2004, as Appl. No. 10/784,838. | ||
| Application 10/784838 is a continuation in part of application No. 10/375967, filed on Feb. 28, 2003, granted, now 6,778,117. | ||
| Application 10/375967 is a continuation in part of application No. 10/377573, filed on Feb. 28, 2003, granted, now 7,447,493. | ||
| Prior Publication US 2004/0176058 A1, Sep. 09, 2004 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. H04B 1/26 (2006.01); H03M 1/00 (2006.01) | ||
| U.S. Cl. 455—313 [455/323; 455/260; 455/258; 341/126] | 46 Claims |
| 1. A tuner comprising:
a direct digital frequency synthesizer having an output terminal for providing a digital local oscillator signal having a
frequency chosen to mix a channel to a desired frequency; and
a mixer having a first input terminal for receiving an analog radio frequency signal, a second input terminal coupled to the
output terminal of the direct digital frequency synthesizer for receiving the digital local oscillator signal, and an output
terminal for providing an analog output signal at a desired frequency said mixer mixing the analog radio frequency signal
with the digital local oscillator signal for providing the analog output signal.
|