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:
Jun. 02, 2009
Filed:
Aug. 08, 2006
Mikio Shigemori, Samukawa, JP;
Masataka Nomura, Minowa, JP;
Mikio Shigemori, Samukawa, JP;
Masataka Nomura, Minowa, JP;
Seiko Epson Corporation, , JP;
Abstract
A phase locked circuit includes a locked loop circuit having a phase comparator, a voltage controlled oscillator, and a variable frequency divider which divides a clock signal foutput from the voltage controlled oscillator by n and outputs it. Additionally, the phase locked circuit includes a band pass filter part which is coupled to an output side of the voltage controlled oscillator via a switching part. A frequency division ratio setting signal to be input into the variable frequency divider is input as a switching signal into the switching part so as to switch a frequency of the clock signal foutput from the voltage controlled oscillator. As synchronizing with switching of the frequency, the switching part switches a plurality of band pass filters provided to the band pass filter part and couples to the voltage controlled oscillator.