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:
Mar. 10, 2009
Filed:
Oct. 24, 2007
Nagayoshi Dobashi, Atsugi, JP;
Shigeki Mabuchi, Atsugi, JP;
Nagayoshi Dobashi, Atsugi, JP;
Shigeki Mabuchi, Atsugi, JP;
Mitsumi Electric Co., Ltd., Tokyo, JP;
Abstract
A variable gain amplifier circuit capable of eliminating circuit elements and the area for circuits when formed into an integrated circuit is disclosed. The circuit includes plural differential circuits, one of the input terminals of each of the differential circuits being connected in common to a signal input terminal, any one of the differential circuits being selected to operate; an output circuit having an input terminal connected in common to each output terminal of the differential circuits, the output circuit inputting an output signal of any of differential circuits and outputting an output signal from the signal output terminal; and plural resistors connected in series between the signal output terminal and a reference voltage terminal, in which each of junctions between the resistors is connected to one of the other input terminals of the differential circuits.