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:
Feb. 15, 2011
Filed:
May. 26, 2006
David S. Trager, San Marcos, TX (US);
Mitchell Reid, Austin, TX (US);
David S. Trager, San Marcos, TX (US);
Mitchell Reid, Austin, TX (US);
Silicon Laboratories, Inc., Austin, TX (US);
Abstract
A receiver () includes a direct digital frequency synthesizer (DDFS) () and first () and second () mixers. The DDFS () has a first output for providing a first local oscillator signal, and a second output for providing a second local oscillator signal offset from a quadrature relationship with the first local oscillator signal by a phase offset. The first mixer () has a first input for receiving a radio frequency (RF) signal, a second input for receiving the first local oscillator signal, and an output for providing an in-phase signal at another frequency. The second mixer () has a first input for receiving the RF signal, a second input for receiving the second local oscillator signal, and an output for providing a quadrature signal at the other frequency. The DDFS () may be implemented using first () and second () memories storing portions of a sinusoidal waveform and extra memories () supporting the phase offset.