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. 26, 2023
Filed:
Jun. 26, 2020
Applicant:
Murata Manufacturing Co., Ltd., Kyoto, JP;
Inventor:
Takashi Soga, Kyoto, JP;
Assignee:
MURATA MANUFACTURING CO., LTD., Kyoto, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03F 1/30 (2006.01); H03F 3/21 (2006.01); H03F 1/32 (2006.01);
U.S. Cl.
CPC ...
H03F 1/302 (2013.01); H03F 1/32 (2013.01); H03F 3/21 (2013.01); H03F 2200/447 (2013.01); H03F 2200/451 (2013.01);
Abstract
A power amplifier circuit includes an amplifier transistor that amplifies an input signal, a resistance element coupled in series with the base of the amplifier transistor, a bias transistor that supplies a bias current from the emitter or the source of the bias transistor to the base of the amplifier transistor through the resistance element, and a feedback circuit that changes a base or gate voltage of the bias transistor to follow a change in the bias current supplied to the base of the amplifier transistor.