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:
May. 19, 2015
Filed:
Dec. 05, 2012
Applicant:
Panasonic Corporation, Osaka, JP;
Inventor:
Ryo Kitamura, Kanagawa, JP;
Assignee:
PANASONIC CORPORATION, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03G 3/00 (2006.01); H03F 3/193 (2006.01); H03G 9/14 (2006.01); H03F 1/56 (2006.01); H03F 3/45 (2006.01);
U.S. Cl.
CPC ...
H03F 3/193 (2013.01); H03G 9/14 (2013.01); H03F 1/56 (2013.01); H03G 3/008 (2013.01); H03F 3/45179 (2013.01); H03F 2203/45394 (2013.01);
Abstract
A variable gain amplifier () includes a transistor (), an FB impedance section (), a source impedance section (), a drain impedance section (), a gain controller (), and a frequency characteristic controller (). The gain controller () varies impedance of one of the FB impedance section (), the source impedance section (), and the drain impedance section (), and outputs a gain control signal. The frequency characteristic controller () varies the impedance of different impedance section, based on the gain control signal.