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. 02, 2025
Filed:
Nov. 04, 2022
Murata Manufacturing Co., Ltd., Kyoto, JP;
Kenichi Shimamoto, Kyoto, JP;
MURATA MANUFACTURING CO., LTD., Kyoto, JP;
Abstract
A power amplifier circuit includes first and second bias circuits to each apply a bias to first and second amplifiers in first and second modes, respectively. The first bias circuit includes: a first transistor having a collector connected to a power supply electric potential, an emitter connected to the first amplifier, and a base connected to a current source; and a second transistor and a third transistor being diode-connected and connected between the base of the first transistor and a reference electric potential. The second bias circuit includes: a fourth transistor having a collector connected to a power supply electric potential, an emitter connected to the second amplifier, and a base connected to a current source; and a fifth transistor having a base connected to the emitter of the fourth transistor, a collector connected to the base of the fourth transistor, and an emitter connected to a reference electric potential.