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:
Apr. 23, 2019
Filed:
Jul. 12, 2017
Applicant:
Fujitsu Limited, Kawasaki-shi, Kanagawa, JP;
Inventors:
Masato Nishimori, Atsugi, JP;
Tatsuya Hirose, Yokohama, JP;
Ikuo Soga, Isehara, JP;
Masayuki Hosoda, Yamato, JP;
Tadahiro Imada, Kawasaki, JP;
Assignee:
FUJITSU LIMITED, Kawasaki, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03F 1/07 (2006.01); H03F 3/195 (2006.01); H03F 1/30 (2006.01); H03G 3/30 (2006.01); H01L 23/66 (2006.01); H03F 1/02 (2006.01);
U.S. Cl.
CPC ...
H03F 3/195 (2013.01); H01L 23/66 (2013.01); H03F 1/0288 (2013.01); H03F 1/30 (2013.01); H03F 1/301 (2013.01); H03G 3/3042 (2013.01); H03F 2200/447 (2013.01); H03F 2200/451 (2013.01); H03F 2200/481 (2013.01);
Abstract
A power amplifier includes a main amplifier, an auxiliary amplifier, and a control circuit. The main amplifier is configured to amplify input power, and the auxiliary amplifier is configured to amplify the input power when the input power exceeds a certain level. The control circuit, which is provided between a source of the main amplifier and a ground, is configured to control a source potential of the main amplifier so as to increase the source potential when the input power reaches at least a certain value.