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. 22, 2006
Filed:
Apr. 30, 2002
Abdellatif Bellaouar, Richardson, TX (US);
Charles Gore, McKinney, TX (US);
Jeff D. Laster, Richardson, TX (US);
Abdellatif Bellaouar, Richardson, TX (US);
Charles Gore, McKinney, TX (US);
Jeff D. Laster, Richardson, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
Multiple-mode direct phase/amplitude modulation circuitry () for use in a transceiver () of a device such as a wireless handset () is disclosed. The modulation circuitry () includes a modulation loop () for modulating a phase signal into a Gaussian-Minimum-Shift-Keyed (GMSK) signal for transmission in a first mode. The modulation loop () may include a phase-locked loop () with its frequency controlled by a Σ-Δ demodulation of a compensated version of the phase signal, or alternatively may produce a modulated signal from a direct digital synthesis circuit (). An amplitude signal is converted into an analog signal and applied to a single-sideband mixer () for combination with a frequency multiplied version of the phase-modulated signal (GMSK(t); PH(t)), producing an amplitude and phase modulated signal for transmission in a second mode.