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. 13, 2008
Filed:
Mar. 29, 2005
Jin Ogasawara, Machida, JP;
Jin Ogasawara, Machida, JP;
Victor Company of Japan, Limited, Yokohama, JP;
Abstract
A locking-status judging circuit is composed of a comparator that compares a phase error signal with a reference signal for judging whether or not a digital PLL circuit locks on an input signal and outputs a signal '0 (zero)' or a signal '1 (one)', a selector that outputs a positive or negative number in response to the inputted signal whether it is “0” or “1”, a limiter that limits an accumulated number to be within a range of prescribed upper and lower limits, a feedback section that returns the accumulated number, an accumulator that adds the accumulated number and a positive or negative number from the selector and outputs a newly accumulated number, and a lock-state judging section that judges the digital PLL circuit whether it is in a lock-state or an unlock-state in response to an accumulated value of the newly accumulated number whether it is positive or negative.