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US007853152B2
(12) United States Patent ao) Patent No.: Us 7,853,152 B2
Nishihara et al. (45) Date of Patent: Dec. 14,2010
2004/0213579 Al * 10/2004 Chewetal 398/183
2005/0117915 Al 6/2005 Miyazaki
2006/0019627 Al * 1/2006 Talbot 455/296
2007/0047971 Al * 3/2007 Ikeuchi 398/202
FOREIGN PATENT DOCUMENTS
JP 2000-59300 2/2000
JP 2000-151505 5/2000
JP 2003-87201 3/2003
JP 2003-92553 3/2003
JP 2005-167474 6/2005
JP 2005-252369 9/2005
JP 2005-260696 9/2005
OTHER PUBLICATIONS
Japanese Patent Office Action mailed Aug. 31, 2010 for corresponding Japanese Patent Application No. 2005-349406.
* cited by examiner
Primary Examiner—Dzung D Tran
(74) Attorney, Agent, or Firm—Staas & Halsey LLP
(57) ABSTRACT
A signal regeneration device which makes an extracted clock signal highly accurate while maintaining superior receiving sensitivity. To this end, a device of the present invention is configured to have a branch section for branching an input electrical signal which has been demodulated from a differential phase-shift modulated state; a first filter for equalizing a waveform of one of the demodulated electrical signals branched by the branch section; a clock recovery section for recovering a clock signal from the demodulated electrical signal whose waveform has been equalized by the first filter; and a data regeneration section for regenerating a data signal from a remaining one of the demodulated electrical signals branched by the branch section and from a clock signal recovered by the clock recovery section.
11 Claims, 10 Drawing Sheets
