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:
Oct. 15, 2002
Filed:
Oct. 25, 1999
Henrik T. Jensen, Los Angeles, CA (US);
Joseph F. Jensen, Malibu, CA (US);
HRL Laboratories, LLC, Malibu, CA (US);
Abstract
A method and apparatus for digital-to-analog conversion utilizing randomized dynamic element matching for the attenuation of harmonic distortion during the conversion process due to non-ideal circuit behavior is presented. The present invention introduces a new DEM approach that results in a simplified DAC architecture relative to previous DACs, while preserving optimal spurious-free dynamic range (SFDR). The particular topology utilized involves the use of a bank of DAC-elements, preferably 1-bit DAC elements, the outputs of which are summed to yield a single multiple-level DAC. During each conversion cycle, random selection is used to determine the addresses of the DAC-elements used in order to “scramble” the DAC noise arising from each individual 1-bit DAC.