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:
May. 18, 1999
Filed:
Sep. 16, 1997
Applicant:
Inventors:
Kurenai Murakami, Tokyo, JP;
Kaoru Yoshida, Tokyo, JP;
Assignee:
NEC Corporation, , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03L / ;
U.S. Cl.
CPC ...
331 18 ; 331 25 ;
Abstract
A numerically controlled oscillator including an RTS value producing circuit which produces a series of residual time stamp (RTS) values indicative of a relation between the setting value and an actual oscillation frequency. A pulse train generator generates a pulse train in a period corresponding to the produced series of RTS values and a phase synchronous oscillator oscillates at a frequency in synchronism with the pulse train output from the pulse train generator. Preferably, the pulse train generated by the pulse train generator is supplied to the RTS value producing circuit as a signal indicative of the actual oscillation frequency.