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:
Mar. 05, 2002
Filed:
Jun. 02, 2000
David E. Bockleman, Weston, FL (US);
Jui-Kuo Juan, Coral Springs, FL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A direct digital synthesizer ( ) includes a first accumulator ( ) that acts as the frequency accumulator in order to generate the desired average frequency. A second accumulator ( ) acts to generate a phase correction at each overflow, with the input into the phase correction accumulator ( ) being a function of the input frequency. The clock signal of the phase correction accumulator ( ) is the overflow signal ( ) of the frequency accumulator ( ). With this configuration, the frequency accumulator ( ) generates the timing, and the phase correction accumulator ( ) generates the interpolation value. The use of the two accumulators ( ) as described, eliminates the need to use a multiplier in the design which is a high current consumption device.