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. 28, 2005
Filed:
Mar. 14, 2003
Hee-chan Doh, Suwon-shi, KR;
Gil-yong Park, Suwon-shi, KR;
Shin-hee Won, Seoul, KR;
Yun-je OH, Yongin-shi, KR;
Tae-sung Park, Suwon-shi, KR;
Hyeon-cheol Ki, Seoul, KR;
Hee-Chan Doh, Suwon-shi, KR;
Gil-Yong Park, Suwon-shi, KR;
Shin-Hee Won, Seoul, KR;
Yun-Je Oh, Yongin-shi, KR;
Tae-Sung Park, Suwon-shi, KR;
Hyeon-Cheol Ki, Seoul, KR;
Samsung Electronics Co., Ltd., Suwon-Si, KR;
Abstract
An automatic-gain-control device in an optical receiver is provided and includes a pre-amplifier for converting a current signal outputted from an optical detector to a voltage signal and a bottom level detector for detecting the bottom level from the output of the pre-amplifier, the automatic-gain-control device comprising a bottom signal-level-determining section for analyzing the bottom level from the bottom level detector and outputting a signal denoting the presence of a signal and a reset signal for initialization at intervals between packets; and an automatic-gain-control signal generating section for providing an automatic-gain-control signal by showing the presence of a signal, the automatic-gain-control-signal-generating section including a first transistor which turns on according to a signal from the bottom signal-level-determining section and a second transistor which is connected to a capacitor for charging or discharging a voltage applied by the first transistor, and the drain voltage of which becomes low when the capacitor is charged but becomes high when the capacitor is discharged.