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:
Nov. 26, 2002
Filed:
Oct. 04, 2001
Yasuaki Sumi, Tottori, JP;
Other;
Abstract
A PLL circuit produces first to n-th (n being an integer equal to or greater than 2) reference signals. A first variable frequency divider divides the frequency of an output of a voltage-controlled oscillator to produce a first feedback signal. A second variable frequency divider divides the output of the voltage-controlled oscillator to produce second to n-th feedback signals. A phase comparator compares the phases of the first to the n-th reference signals with the phases of the first to the n-th feedback signals to produce first to n-th error signals. A controller produces a control signal from the error signals. The PLL circuit synchronizes the first reference signal with the first feedback signal in phase after the phase difference between at least one of the first to n-th reference signals and a corresponding feedback signal becomes smaller than a predetermined value. The frequency-division ratio of the second variable frequency divider is 1/n that of the first variable frequency divider.