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:
Jun. 09, 2015
Filed:
May. 23, 2013
Hitachi, Ltd., Tokyo, JP;
Takashi Takemoto, Fuchu, JP;
Hiroki Yamashita, Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
Provided is a transimpedance amplifier which can realize a high-speed and high-quality receiver operation in an optical communication module or a router device having the optical communication module. An offset voltage which is generated in a post amplifier for differentiating and amplifying a single-phase output signal from a pre-amplifier in accordance with single-phase differentiation and conversion is cancelled by detecting a threshold voltage from an output of the pre-amplifier or an output of the post amplifier by a threshold detection circuit and by shifting a level of the threshold voltage corresponding to an offset amount to be compensated.