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:
Sep. 02, 2025
Filed:
Nov. 15, 2022
Murata Manufacturing Co., Ltd., Kyoto, JP;
Masakazu Hirobe, Kyoto, JP;
MURATA MANUFACTURING CO., LTD., Kyoto, JP;
Abstract
A radio-frequency circuit includes an amplifier circuit, a bias circuit, a bias control circuit, a comparing section, a variable resistance circuit, and a control unit. The amplifier circuit includes a transistor that amplifies a radio-frequency signal input to an input terminal and outputs the radio-frequency signal from an output terminal. The bias circuit supplies a bias current or a bias voltage to the input terminal of the transistor. The comparing section compares a threshold voltage with a power supply voltage of a power supply terminal connected to the output terminal of the transistor. The variable resistance circuit is connected between the power supply terminal and the output terminal. The variable resistance circuit includes a parallel circuit made up of a resistive element and a switch element. The control unit changes a resistance value of the variable resistance circuit in accordance with a compared result of the comparing section.