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:
Aug. 21, 2012
Filed:
Nov. 12, 2008
Daisuke Umeda, Osaka, JP;
Daisuke Umeda, Osaka, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
An amplifier includes a first transistor having a first conducting electrode receiving a current, a control electrode coupled to the first conducting electrode, and a second conducting electrode coupled to a fixed voltage source; a second transistor having a first conducting electrode, a second conducting electrode and a control electrode coupled to the control electrode of the first transistor; a feedback resistance coupled to the control electrode of the second transistor for feeding back an output of the second transistor to the control electrode of the second transistor; and a variable resistance element for controlling a ratio between a current flowing from the first conducting electrode of the first transistor into the control electrode of the second transistor and the feedback resistance and a current flowing from the first conducting electrode into the second conducting electrode in the first transistor.