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. 11, 2018
Filed:
Mar. 12, 2018
Applicant:
Murata Manufacturing Co., Ltd., Kyoto, JP;
Inventors:
Shota Ishihara, Kyoto, JP;
Yusuke Shimamune, Kyoto, JP;
Assignee:
MURATA MANUFACTURING CO., LTD., Kyoto-Fu, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03F 1/30 (2006.01); H03F 3/21 (2006.01); H03F 3/195 (2006.01); H03F 3/213 (2006.01);
U.S. Cl.
CPC ...
H03F 1/30 (2013.01); H03F 3/195 (2013.01); H03F 3/211 (2013.01); H03F 3/213 (2013.01); H03F 2200/156 (2013.01); H03F 2200/219 (2013.01); H03F 2200/451 (2013.01); H03F 2203/21181 (2013.01);
Abstract
A power amplifier module includes an amplifier that amplifies an input signal and outputs an amplified signal, an emitter follower transistor that supplies a bias signal to the amplifier to control a bias point of the amplifier, and a current source that supplies a control current which changes in accordance with a change in control voltage to a collector of the emitter follower transistor. The current source limits the control current to not greater than an upper limit.