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:
Apr. 20, 2010
Filed:
May. 25, 2007
Gordon Old, Edinburgh, GB;
Gordon Old, Edinburgh, GB;
XILINX, Inc., San Jose, CA (US);
Abstract
Phase-to-sinusoid conversion and method for direct digital synthesis are described. At least one quadrant of values for a sinusoidal signal are real-to-finite bit resolution mapped to provide preconditioned values which are on average shifted down by half of a LSB position. The at least one quadrant of preconditioned values are stored in a lookup table. MSBs of a phase-accumulated signal are used as an address for accessing from the lookup table a sinusoid value. At least a logicis added as an LSB to an interim output associated with the sinusoid value to provide an adjusted sinusoid value having a bit width greater than that of the sinusoid value to provide a digitally synthesized sinusoidal value.