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:
May. 14, 1991
Filed:
Aug. 29, 1989
Sadao Tanikoshi, Tokyo, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
An apparatus and method for controlling gain automatically uses a light receiving element, a gain amplifier, a difference amplifier, a controller and a variable level circuit. The light receiving element generates electrical signals corresponding to received optical signals. The gain amplifier amplifies the electrial signals and the difference amplifier generates signals corresponding to the difference between defined level of amplified signal and predetermined level. In response to output signals from the difference amplifier, the controller generates signals for controlling gain of the gain amplifier and multiplication factor of the receiving element. The level circuit supplies signals to the receiving element in response to output signals from the controller.