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:
Nov. 21, 2006
Filed:
Aug. 06, 2004
Takeo Suzuki, Fukushima-ken, JP;
Akira Asao, Fukushima-ken, JP;
Takeo Suzuki, Fukushima-ken, JP;
Akira Asao, Fukushima-ken, JP;
Alps Electric Co., Ltd., Tokyo, JP;
Abstract
A balanced gain control amplifier contains first and second transistors differentially connected to each other and having their emitters connected to a first current source. The balanced gain control amplifier also contains third and fourth transistors differentially connected to each other and having their emitters connected to a second constant current source. The collectors of the first and fourth transistors are connected to a power terminal through a common first load resistor, and the collectors of the second and third transistors are connected to the power terminal through a common second load resistor. A signal may be input between the bases of the first and third transistors and the bases of the second and fourth transistors. The current of the second constant current source is variable in a range no more than the current value of the first constant current source.