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:
Sep. 14, 2010
Filed:
Mar. 19, 2008
Takayuki Nakai, Osaka, JP;
Takuma Ishida, Osaka, JP;
Takayuki Nakai, Osaka, JP;
Takuma Ishida, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
There is provided an AGC circuit that has a very small offset voltage and is easy for integration, without using any of external capacities. For that reason, a variable gain amplifying circuit (GCA) which has a gain controlled by a gain control signal, and whose output DC offset is controlled by an offset compensation signal, an A/D conversion circuit (AD) for A/D converting an output signal of this variable gain amplifying circuit (GCA), a level detection circuit (Det) for performing peak detection of an output signal of this A/D conversion circuit (AD) to thereby detect an amplitude level, a gain control circuit (Gctrl) for outputting a gain control signal according to an output signal of this level detection circuit (Det), an offset detection circuit (Det) provided with a lowpass filter for taking out a DC component from the output signal of the A/D conversion circuit (AD), and a D/A conversion circuit (DA) for D/A converting an output signal of the offset detection circuit (Det) to thereby output the offset compensation signal are provided.