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:
Apr. 26, 2005
Filed:
Jun. 11, 2003
Hiroshi Suzunaga, Kanagawa, JP;
Hiroshi Suzunaga, Kanagawa, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
An optical signal receiving circuit disclosed herein comprises: a first transimpedance amplifier configured to convert a first current signal into a first voltage signal, wherein the first current signal is generated in a first photodiode, to which an optical signal is inputted; a reference voltage generating circuit configured to generate a second voltage signal which is independent of the first voltage signal and which is a signal of a reference voltage; a level shift circuit configured to shift at least one of the first voltage signal and the second voltage signal in a close direction and output it, wherein the close direction is a direction in which the center voltage of the amplitude of the first voltage signal and the voltage of the second voltage signal get closer; and a differential amplifier which amplifies a difference between the first voltage signal and the second voltage signal.