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. 28, 1998
Filed:
Feb. 25, 1997
Chun-Sup Kim, Suwon, KR;
Yong-Serk Kim, Suwon, KR;
Samsung Electronics Co., Ltd., Kyungki-Do, KR;
Abstract
A preamplifier for an optical disc system. The preamplifier is based on an automatic gain control (AGC) system for obtaining a constant response and a stable output signal for input signals of a certain amplitude. The preamplifier includes a radio frequency amplifier for amplifying an output signal from the pick-up unit, an AGC unit for amplifying an output signal from the radio frequency amplifier to a desired level, an AGC detector unit coupled at its input terminal to an output terminal of the AGC unit and at its output terminal to an input terminal of the AGC unit. The AGC detector unit serves to rectify an output signal from the AGC unit, compare the rectified signal with a reference signal having a predetermined level, and send the resultant signal obtained by the comparison to the AGC unit. A mode selecting unit is coupled to the AGC detector unit and adapted to select one of several modes of operation, respectively corresponding to different equalization characteristics.