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. 17, 2012
Filed:
Jun. 25, 2009
Tadashi Jahana, Kanagawa, JP;
Tadashi Jahana, Kanagawa, JP;
Renesas Electronics Corporation, Kanagawa, JP;
Abstract
A first optical receiver circuit in an optical receiver IC, which composes an optical disk device, generates a first voltage signal VSindicating an amount of light of a laser beam oscillated in a multimode. A second optical receiver circuit generates a second voltage signal VSindicating an amount of light of an optical feedback from an optical disk. A binarization circuit extracts a band component corresponding to a predetermined frequency in VS, and binarizes the band component, thereby obtaining a digital signal. A delay element delays a phase of the digital signal by time equivalent to a phase difference between VSand VS, and outputs the phase delayed signal as a timing signal. A sample hold circuit (S/H) samples and holds the VSin synchronization with the timing signal. Further, A LPF eliminates a band component corresponding to the frequency from an output signal of the S/H.