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. 08, 2003
Filed:
Jul. 24, 2001
Naomi Ohashi, Yokohama, JP;
Kazuhiro Nojima, Yokohama, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
In an automatic gain control circuit comprising a variable gain amplifying circuit for amplifying an input signal through the use of variable gain control to send out an output signal and a gain control circuit for amplitude-controlling the input signal fed into the variable gain amplifying circuit, a peak detecting circuit of the variable gain amplifying circuit detects a peak voltage value of the output signal, and the gain control circuit generates an amplitude control signal corresponding to an amplitude value of the output signal. The generated amplitude control signal is fed back to the variable gain amplifying circuit for controlling the amplitude of the output signal to a constant value with respect to amplitude variations of the input signal. With this arrangement, even if a largely amplitude-varying input signal appears, the gain control circuit can control the amplitude of the output signal readily to a constant value.