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. 21, 2012
Filed:
Aug. 23, 2007
Nir Tal, Haifa, IL;
Yossi Tsfaty, Rishon Le Zion, IL;
Robert B. Staszewski, Delft, NL;
Gregory Lerner, Petach Tikva, IL;
Nir Tal, Haifa, IL;
Yossi Tsfaty, Rishon Le Zion, IL;
Robert B. Staszewski, Delft, NL;
Gregory Lerner, Petach Tikva, IL;
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A novel and useful apparatus for and method of local oscillator (LO) generation with non-integer multiplication ratio between the local oscillator and RF frequencies. The LO generation schemes presented are operative to generate I and Q square waves at a designated frequency while avoiding the well known issue of harmonic pulling. A synthesizer provides 4/3 the desired frequency f. This frequency is divided by two to obtain in-phase and quadrature square waves at ⅔ f. The in-phase signal is divided by two again to obtain in-phase and quadrature square waves at ⅓ f. The signals are then logically combined using XOR operations to obtain I and Q branch signals containing spectral spurs. Since the spurs are located in non-disturbing bands, they can be filtered out resulting in the desired output signal.