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:
Jan. 19, 1993
Filed:
Dec. 19, 1991
Applicant:
Inventor:
Rolf H Wendt, Beaverton, OR (US);
Assignee:
NEC America Inc., Melville, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03B / ; H03B / ; H03K / ; H03K / ;
U.S. Cl.
CPC ...
328 14 ; 328 27 ; 328186 ; 307227 ;
Abstract
Many electronic systems such as telephone systems require highly accurate DC-to-AC signal generators such as sine wave generators. A sine wave generator according to the present invention includes a pair of multiplexers, each receiving a plurality of DC voltages from a voltage divider network and having a common output in a summing circuit to produce a sine wave at a predetermined frequency. The multiplexers are controlled by a single up/down counter element which drives the multiplexers to produce identical waveforms in each of the four quadrants of the sine wave. The sine wave frequency can be controlled by controlling a signal provided to the up/down counter.