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:
Aug. 31, 2010
Filed:
Dec. 07, 2005
Nir Tal, Haifa, IL;
Sameh S. Rezeq, Dallas, TX (US);
Robert B. Staszewski, Garland, TX (US);
Oren E. Eliezer, Plano, TX (US);
Ofer Friedman, Yehud, IL;
Nir Tal, Haifa, IL;
Sameh S. Rezeq, Dallas, TX (US);
Robert B. Staszewski, Garland, TX (US);
Oren E. Eliezer, Plano, TX (US);
Ofer Friedman, Yehud, IL;
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A transmitter employing a sigma delta modulator having a noise transfer function adapted to shift quantization noise outside at least one frequency band of interest. A technique is presented to synthesize the controllers within a single-loop sigma delta modulator such that the noise transfer function can be chosen arbitrarily from a family of functions satisfying certain conditions. Using the novel modulator design technique, polar and Cartesian (i.e. quadrature) transmitter structures are supported. A transmitter employing polar transmit modulation is presented that shapes the spectral emissions of the digitally-controlled power amplifier such that they are significantly and sufficiently attenuated in one or more desired frequency bands. Similarly, a transmitter employing Cartesian transmit modulation is presented that shapes the spectral emissions of a hybrid power amplifier such that they are significantly and sufficiently attenuated in one or more desired frequency bands.