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:
Dec. 27, 2016
Filed:
Feb. 19, 2015
Applicant:
Sumitomo Electric Device Innovations, Inc., Yokohama-shi, JP;
Inventor:
Shingo Inoue, Yokohama, JP;
Assignee:
Sumitomo Electric Device Innovations, Inc., Yokohama-shi, JP;
Primary Examiner:
Int. Cl.
CPC ...
H03F 1/14 (2006.01); H03F 1/30 (2006.01); H03F 1/34 (2006.01); H03F 3/193 (2006.01);
U.S. Cl.
CPC ...
H03F 1/301 (2013.01); H03F 1/342 (2013.01); H03F 3/193 (2013.01); H03F 2200/18 (2013.01); H03F 2200/375 (2013.01); H03F 2200/451 (2013.01); H03F 2200/462 (2013.01);
Abstract
An RF amplifier that compensates the drift appearing after a sudden decrease of the drain current is disclosed. The RF amplifier detects the drain current by the bias control unit that feeds the change of the drain current back to the gate bias of the FET. The bias control unit responds to the sudden increase of the drain current by a relatively longer time constant; while, to the sudden decrease thereof by the second time constant enough shorter than the first time constant to compensate the drift appearing after the sudden decrease of the drain current.