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. 19, 2006
Filed:
Oct. 27, 2004
Yutaka Ohtani, Hirakata, JP;
Hiroshi Komori, Ohtsu, JP;
Yutaka Ohtani, Hirakata, JP;
Hiroshi Komori, Ohtsu, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A high pass filter is disposed to an output part of a gain control amplifier. A gain control signal change detector detects a change of a gain control signal from the gain control amplifier. Upon detection of a change of the gain control signal, a counter and a clock generator generate a cancel pulse which has a certain width, and using the cancel pulse, a first switch cuts an AC signal which is fed to the gain control amplifier. Further, using the same cancel pulse, a second switch reduces the time constant of the high pass filter. Through this operation, a transient response of a DC offset is eliminated.