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. 07, 2003
Filed:
Aug. 22, 2000
Satoshi Ueno, Ome, JP;
Nobuhiro Shiramizu, Kokubunji, JP;
Kiyoshi Hayashi, Takamatsu, JP;
Takashi Harada, Hidaka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The present invention provides an optical interconnection receiving module that can cancel out the effect of cross talk noise caused by the input signal of another channel on the preamplifier side and the reference amplifier side, and provides suitable device structures for a bypass capacitor used to stabilize supply voltage and for a capacitance device used to cancel out the effect of cross talk noise caused by the input signal of another channel on the preamplifier side and on the reference amplifier side. According to the present invention, there are provided: a photodiode array comprising a plurality of photodiodes, each of which receives an optical signal on a plurality of channels and converts the optical signal into an electric signal; and a receiving circuit for distinguishing an input signal which comprises: a preamplifier for amplifying the electric signal converted from the optical signal by the photodiode array for each of the channels; a comparator; and a reference amplifier for generating reference voltage, wherein a plurality of capacitance devices each equivalent to the photodiode are formed on the semiconductor chip where the receiving circuit is formed, and each of the equivalent capacitance devices is connected between the input terminal of the reference amplifier and a supply voltage terminal.