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. 29, 2020
Filed:
Dec. 18, 2018
Applicant:
Murata Manufacturing Co., Ltd., Kyoto, JP;
Inventors:
Masao Kondo, Kyoto, JP;
Satoshi Tanaka, Kyoto, JP;
Yasuhisa Yamamoto, Kyoto, JP;
Takayuki Tsutsui, Kyoto, JP;
Isao Obu, Kyoto, JP;
Assignee:
MURATA MANUFACTURING CO., LTD., Kyoto, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03F 1/02 (2006.01); H03F 3/19 (2006.01); H03G 3/30 (2006.01); H03F 3/24 (2006.01); H03G 3/00 (2006.01);
U.S. Cl.
CPC ...
H03F 1/0211 (2013.01); H03F 1/0261 (2013.01); H03F 3/19 (2013.01); H03F 3/245 (2013.01); H03G 3/007 (2013.01); H03G 3/3042 (2013.01); H03F 2200/102 (2013.01); H03F 2200/211 (2013.01); H03F 2200/222 (2013.01); H03F 2200/387 (2013.01); H03F 2200/451 (2013.01); H03F 2203/21103 (2013.01); H03F 2203/21139 (2013.01); H03G 2201/106 (2013.01);
Abstract
A transmission unit includes a first transistor that amplifies power of a first signal and outputs a second signal, a power supply circuit that supplies to the first transistor a power supply voltage that changes in accordance with an amplitude level of the first signal, and an attenuator that attenuates the first signal in such a manner that an amount of attenuation of the first signal increases with a decrease in the power supply voltage when the power supply voltage is less than a first level.