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, 1991
Filed:
Feb. 20, 1990
Applicant:
Inventor:
Tzafrir Sheffer, Seattle, WA (US);
Assignee:
John Fluke Mfg. Co., Inc., Everette, WA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H03K / ; H03C / ;
U.S. Cl.
CPC ...
328 14 ; 364718 ;
Abstract
The frequency resolution of a direct digital synthesizer is increased by varying the phase increment used to accumulate wave lookup table addresses between two integer values. The time periods during which the larger integer value is employed is proportional to a fractional part of the desired phase increment for providing an analog output at a selected frequency.