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. 03, 1997
Filed:
Mar. 16, 1995
Kazuhisa Kogure, Oyama, JP;
Hirokazu Osada, Oyama, JP;
Yasuhiro Tanaka, Sapporo, JP;
Hiroo Kitasagami, Kawasaki, JP;
Makoto Miyoshi, Oyama, JP;
Kakuji Inoue, Oyama, JP;
Takayoshi Ikegami, Sapporo, JP;
Kenichi Kobayashi, Oyama, JP;
Shinichiro Sano, Oyama, JP;
Setsuo Misaizu, Oyama, JP;
Masahiko Yamashita, Kawasaki, JP;
Tatsuya Nishimura, Kawasaki, JP;
Fujitsu Limited, Kanagawa, JP;
Abstract
In an equalizing amplifier that equalizes an electric signal obtained from a light signal received via an optical transmission path, an AGC circuit generates first and second signals from the electric signal by referring to a threshold voltage. The first and second signals are complementary signals. An offset compensation circuit generates a first difference signal based on a difference between the first and second signals, compares the first difference signal with a first reference signal, and outputs, as the threshold voltage, a resultant error signal to the AGC circuit. The threshold voltage is varied so that it is located in the center of an amplitude of the electric signal whereby an offset of the AGC circuit can be compensated for.