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. 16, 2024
Filed:
Aug. 13, 2021
Applicant:
Murata Manufacturing Co., Ltd., Kyoto, JP;
Inventors:
Tsutomu Oonaro, Kyoto, JP;
Masamichi Tokuda, Kyoto, JP;
Makoto Tabei, Kyoto, JP;
Kazuaki Deguchi, Kyoto, JP;
Takayuki Kawano, Kyoto, JP;
Assignee:
MURATA MANUFACTURING CO., LTD., Kyoto, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03F 1/30 (2006.01); H03F 1/02 (2006.01); H03F 3/21 (2006.01);
U.S. Cl.
CPC ...
H03F 1/301 (2013.01); H03F 1/0211 (2013.01); H03F 3/21 (2013.01); H03F 2200/447 (2013.01); H03F 2200/451 (2013.01);
Abstract
An amplifier device includes an amplifier including cascade-connected power amplifiers in a plurality of stages and a bias circuit configured to supply bias currents to the amplifier. A bias current supplied to a power amplifier in the first stage of the power amplifiers in the plurality of stages exhibits a positive temperature characteristic. A bias current supplied to a power amplifier in the final stage exhibits a negative temperature characteristic.