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:
Jul. 07, 2009
Filed:
Feb. 23, 2007
Hideyuki Takahashi, Hachioji, JP;
Hiroyuki Yoshioka, Akishima, JP;
Hidefumi Yoshida, Ome, JP;
Shogo Irikura, Fussa, JP;
Hideyuki Takahashi, Hachioji, JP;
Hiroyuki Yoshioka, Akishima, JP;
Hidefumi Yoshida, Ome, JP;
Shogo Irikura, Fussa, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An optical signal receiving circuit has a current-voltage converting circuit which receives the output current signal of a photoelectric converting circuit, converting an optical signal into the current signal, and converts the current signal into a voltage signal. A differential circuit in the subsequent stage to the current-voltage converting circuit uses a resistor as its current source to facilitate setting of an operating voltage level in the circuit. To eliminate an adverse effect of asymmetry of the output waveform from the differential circuit due to the use of the resistor, the reference voltage level as the other input to the reference circuit is generated from the output voltage signal of the current-voltage converting circuit by a voltage generating circuit incorporating a feed-forward-controlling connection. Thus, coexistence of high bandwidth characteristics and broad dynamic range having so far been difficult to attain by low voltage apparatus can be realized.