Murata Manufacturing Co., Ltd.

Ryoki Shikishima

Satoshi Tanaka

Atsushi Kurokawa

Kenichi Shimamoto

Fumio Harima

Hiroaki Tokuya

Takayuki Kawano

Hideyuki Sato

A directional coupler includes: a main line () through which a main signal () flows; a sub-line () through which a sub-signal () corresponding to the main signal () flows by electromagnetic coupling with the main line (); and an inductor () that is connected in series with one line among the main line () and the sub-line () and through which one signal among the main signal () and the sub-signal () flows. A first portion () of a first wiring line () forming the inductor () and a second portion () of a second wiring line () forming the other line among the main line () and the sub-line () are electromagnetically coupled with each other.

Directional coupler

A power amplifier circuit includes a first transistor disposed on a semiconductor substrate; a second transistor disposed on the semiconductor substrate and configured to supply a bias current based on a first current which is a part of a control current to the first transistor; a third transistor disposed on the semiconductor substrate and having a collector configured to be supplied with a second current which is a part of the control current and an emitter configured to output a third current based on the second current; a first bump electrically connected to an emitter of the first transistor and disposed so as to overlap a first disposition area in which the first transistor is disposed in plan view of the semiconductor substrate; and a second bump disposed so as to overlap a second disposition area in which the third transistor is disposed in the plan view.

Power amplifier circuit and semiconductor device

Growing community of inventors

Kyoto, Japan

Ryoki Shikishima