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. 23, 2010
Filed:
May. 20, 2009
Masakatsu Maeda, Osaka, JP;
Takayuki Tsukizawa, Osaka, JP;
Hiroyuki Yoshikawa, Tokyo, JP;
Shunsuke Hirano, Kanagawa, JP;
Masakatsu Maeda, Osaka, JP;
Takayuki Tsukizawa, Osaka, JP;
Hiroyuki Yoshikawa, Tokyo, JP;
Shunsuke Hirano, Kanagawa, JP;
Panasonic Corporation, Osaka, JP;
Abstract
Provided is a PLL oscillation circuit that can reduce the variability of modulation sensitivity of a VCOand obtain a desired output amplitude quickly with high precision. An amplitude detectordetects an output amplitude of the VCO. An amplitude controllercontrols a current value of a variable current sourceso as to have an output amplitude of the VCOdetected by the amplitude detectorto be a desired amplitude. A LPFis connected between the amplitude controllerand the variable current source. A switchconnects or disconnects the LPFbetween the amplitude controllerand the variable current source. The amplitude controlleris connected to the variable current sourcethrough either the LPFor the switching switch