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:
Apr. 17, 2007
Filed:
Apr. 03, 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, Gyeonggi-Do, KR;
Abstract
In an optical receiver having a pre-amplifier for converting a current signal outputted from an optical detector to a voltage signal, a signal level detecting device is provided to provide an LOS (loss of signal) signal and a reset signal from the output of the pre-amplifier. The signal level detecting device comprising: a capacitor for receiving the output from the pre-amplifier; first and second transistors each consisting of an emitter and a collector connected to the output of the pre-amplifier and a base connected to the collector; a third transistor having a collector connected to the collector of the first transistor and an emitter connected to the collector of the second transistor; and, a common emitter circuit with a pair of resistors connected, respectively, to the emitter and collector of the third transistor and capable of detecting the level of a signal inputted from the collector of the third transistor.