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:
Mar. 04, 2025
Filed:
Mar. 24, 2022
Murata Manufacturing Co., Ltd., Kyoto, JP;
Naofumi Takezono, Kyoto, JP;
Masashi Maruyama, Kyoto, JP;
MURATA MANUFACTURING CO., LTD., Kyoto, JP;
Abstract
A power amplifier circuit includes an amplifier transistor that amplifies a radio-frequency signal and outputs the radio-frequency signal, and a bias circuit that supplies a bias current to a base of the amplifier transistor. The bias circuit includes a bias current supply transistor, and an electrostatic capacity circuit whose electrostatic capacity varies in accordance with a temperature of the amplifier transistor and that is charged in a non-supply period during which the bias current is not supplied and discharges to a supply path for the bias current in a supply period during which the bias current is supplied. The supply period during which the bias current is supplied includes an amplification period during which the radio-frequency signal is amplified by the amplifier transistor. The bias current starts to be supplied before the amplifier transistor starts amplification.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile