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:
May. 22, 2007
Filed:
Aug. 31, 2005
Ali Behboodian, Natick, MA (US);
Wayne W. Ballantyne, Coconut Creek, FL (US);
Radu C. Frangopol, Plantation, FL (US);
Audley F. Patterson, Miramar, FL (US);
Ali Behboodian, Natick, MA (US);
Wayne W. Ballantyne, Coconut Creek, FL (US);
Radu C. Frangopol, Plantation, FL (US);
Audley F. Patterson, Miramar, FL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A sigma delta digital-to-analog (D/A) converter system () includes a summing device () at an input of a D/A converter (), and a low frequency low amplitude wave signal () injected at an input of the summing device that remains unfiltered and is used to suppress spurious tone artifacts. The D/A converter system can further include an amplitude control and a frequency control for selectively adjusting the frequency and the amplitude of the low frequency low amplitude wave signal being injected. Note, the low frequency low amplitude repeating wave signal generator can take the form of a digital signal processor (DSP) () having the appropriate software to generate such signals.