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:
Aug. 03, 1993
Filed:
May. 26, 1992
Applicant:
Inventors:
Takaaki Yamada, Kanagawa, JP;
Hiroshi Yamagata, Kanagawa, JP;
Assignee:
Sony Corporation, Tokyo, JP;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H03B / ; H03L / ; H03L / ;
U.S. Cl.
CPC ...
331 45 ; 331 / ;
Abstract
A digital VCO is disclosed which comprises a ring oscillator formed of a plurality of inverters connected in series, each inverter being capable of controlling its delay amount, a frequency controlling circuit for controlling the oscillation frequency of the ring oscillator to coincide with a reference frequency, a selector switch for selecting specified output taps from output taps, each thereof being provided for each of the plurality of inverters, to take out the outputs therefrom, and switching control means for controlling the output taps from which the outputs are taken out to be cyclically switched through the selector switch.