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:
Dec. 26, 2017
Filed:
Sep. 26, 2014
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Ntt Electronics Corporation, Kanagawa, JP;
Hiroshi Koizumi, Tokyo, JP;
Masafumi Nogawa, Tokyo, JP;
Masatoshi Tobayashi, Kanagawa, JP;
Masahiro Endo, Kanagawa, JP;
NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo, JP;
NTT ELECTRONICS CORPORATION, Kanagawa, JP;
Abstract
A transimpedance amplifier circuit () includes an amplifier () that amplifies a received signal, an automatic gain control (AGC) circuit () that controls the amplification gain of the amplifier by a first time constant in accordance with the level of the received signal, and a first selection circuit () that selects the first time constant from a plurality of predetermined values. This can simultaneously implement a short time constant of an AGC function necessary to instantaneously respond to a burst signal and a long time constant of the AGC function necessary to obtain a satisfactory bit error rate (BER) characteristic in a continuous signal by an inexpensive and compact circuit arrangement.