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. 30, 2008
Filed:
Apr. 14, 2006
Dae-hoon Kwon, Seoul, KR;
Jeong-won Lee, Seongnam-si, KR;
Dae-hoon Kwon, Seoul, KR;
Jeong-won Lee, Seongnam-si, KR;
Samsung Electronics Co., Ltd., Suwon-si, KR;
Abstract
An automatic gain controller includes a variable gain amplifier for amplifying an input signal having a specified DC level on the basis of the DC level, and outputting a first differential signal having a specified gain α, a second differential signal having a 180° phase difference from the first differential signal, and an output signal obtained by subtracting the second differential signal from the first differential signal; a full-wave-rectifying unit for full-wave-rectifying the first differential signal and the second differential signal; a low-pass filter for extracting the DC component from the output signal of the full-wave-rectifying unit and outputting the extracted DC component; a reference voltage level adjustment unit for adjusting a DC level of a reference voltage; and a comparison unit for comparing the output signal of the low-pass filter with the output signal of the reference voltage level adjustment unit to adjust a gain of the variable gain amplifier.