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. 22, 2012
Filed:
May. 26, 2010
Tetsuji Yamabana, Kawasaki, JP;
Kouichi Kanda, Kawasaki, JP;
Tetsuji Yamabana, Kawasaki, JP;
Kouichi Kanda, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
In a PLL circuit, a threshold discriminator generates a control signal indicating a relative level of a control voltage. A controller outputs a controlling value based on the control signal. If the control signal indicates a high level when the controlling value specifies a control voltage-to-oscillation frequency correspondence relation whose upper and lower limits of oscillation frequency are highest, and if the control signal indicates a low level when the controlling value specifies a correspondence relation whose upper and lower limits of oscillation frequency are lowest, the controller outputs a predetermined controlling value. An oscillator has the correspondence relations set therein such that the correspondence relations have respective different upper and lower limits of oscillation frequency and are correlated with the respective controlling values. The oscillator outputs a signal with the oscillation frequency corresponding to the control voltage and associated with the correspondence relation specified by the controlling value.