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:
Jan. 16, 2001
Filed:
Dec. 30, 1998
Kazuhiro Mori, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A PLL frequency synthesizer has: a reference frequency generator which issues a first frequency signal; a PLL section which outputs a phase error signal based on the first frequency signal and a second frequency signal; a first filter which smoothes the phase error signal output from the PLL section according to a first reference, and which outputs a first smoothed phase error signal; a second filter which smoothes the phase error signal output from the PLL section according to a second reference, and which outputs a second smoothed phase error signal; a switch which issues, in a switching mode, the first or second smoothed phase error signal output from the first filter or the second filter; an output frequency generator which issues a second frequency signal based on the first or second smoothed phase error signal to the PLL section; and a switch controller which controls the changeover of the switch.