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:
Sep. 30, 1997
Filed:
Sep. 01, 1995
Robert Karl Hansen, Scottsdale, AZ (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A numerically controlled oscillator (NCO) (10) or direct digital synthesizer (DSS) includes a phase accumulator (12, 28, 30), a phase to amplitude converter (24), and a digital to analog converter (26). The phase accumulator is partitioned into a high speed phase accumulator stage (44) and a low speed phase accumulator stage (46). The high speed stage (44) performs modulo accumulation on the most significant N.sub.M bits of the entire phase word. The low speed stage (46) performs modulo accumulation on the least significant N.sub.L bits of the entire phase word. The low speed stage (46) supplies a carry signal to the high speed stage (44). The low speed stage (46) operates with an accumulation period that is 2.sup.X times slower than the accumulation period for the high speed stage (44). A phase output is taken from the most significant N.sub.p of the N.sub.M bits accumulated in the high speed stage (44), where desirably N.sub.M .gtoreq.N.sub.p +X.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile