公开(公告)号：US11528012B2

公开(公告)日：2022-12-13

申请号：US17089766

申请日：2020-11-05

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Takayuki Tsutsui ,  Satoshi Tanaka ,  Kiichiro Takenaka ,  Masatoshi Hase

IPC: H03F3/21 ,  H03H11/32 ,  H03F3/45

Abstract: An active balun circuit includes first and second transistors having emitters electrically coupled to each other and configured to output differential signals and a circuit element coupled between the connection point of the emitter of the first transistor and the emitter of the second transistor and a reference potential. The impedance of the circuit element at a particular frequency of the input signal appears significantly larger than impedances at other frequencies. An input signal from an input terminal is inputted to the base of the first transistor. The reference potential is applied to the base of the second transistor. A supply voltage is applied to the collector of the first transistor and the collector of the second transistor. A signal from the collector of the first transistor and a signal from the collector of the second transistor are outputted as the differential signals.

公开(公告)号：US11496178B2

公开(公告)日：2022-11-08

申请号：US17015477

申请日：2020-09-09

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Satoshi Sakurai ,  Satoshi Arayashiki ,  Satoshi Tanaka ,  Kyoichi Hirayama ,  Tomohito Ito ,  Kenta Kurahashi

IPC: H04B1/48 ,  H04B1/00

Abstract: A high-frequency module includes a transmission signal amplifier that outputs a transmission signal to an antenna terminal side; a reception signal amplifier that amplifies a reception signal supplied from an antenna terminal; a switch that selectively connects the antenna terminal to either an output of the transmission signal amplifier or an input of the reception signal amplifier; and a directional coupler that is provided on a transmission signal path and detects a signal level of the transmission signal. The transmission signal amplifier is controlled by a first control signal supplied from a first control circuit. The reception signal amplifier is controlled by a second control signal supplied from a second control circuit. The switch is controlled by a switch control signal supplied from the first control circuit. The directional coupler is controlled by a coupler control signal supplied from the first control circuit.

公开(公告)号：US11258406B2

公开(公告)日：2022-02-22

申请号：US16458409

申请日：2019-07-01

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Satoshi Tanaka ,  Masatoshi Hase ,  Yuri Honda ,  Kazuo Watanabe ,  Takashi Soga

IPC: H03F3/19 ,  H03F1/02 ,  H03F1/56 ,  H03F3/24 ,  H03F3/213 ,  H03F3/195 ,  H03F1/22

Abstract: A power amplifier circuit includes a first transistor, a second transistor, a first bias circuit supplying a first bias current or voltage, a second bias circuit supplying a second bias current or voltage, a first inductor, and a first capacitor. A power supply voltage is supplied to a collector of the first transistor, and an emitter thereof is grounded. A radio frequency signal and the first bias current or voltage are supplied to a base of the first transistor. The power supply voltage is supplied to a collector of the second transistor, and an emitter thereof is connected to the collector of the first transistor via the first capacitor and is grounded via the first inductor. The second bias current or voltage is supplied to a base of the second transistor. An amplified radio frequency signal is output from the collector of the second transistor.

公开(公告)号：US11133574B2

公开(公告)日：2021-09-28

申请号：US16601875

申请日：2019-10-15

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Ryuken Mizunuma ,  Satoshi Tanaka ,  Yasuhisa Yamamoto ,  Akiko Itabashi

IPC: H01Q1/24 ,  H04B7/0413 ,  H01Q1/22 ,  G06F1/16

Abstract: A communication device includes: a first body including a first display portion; a second body including a second display portion; a communication circuit that carries out millimeter-wave band communication; and one or more millimeter-wave band communication antennas provided in at least one of the first body and the second body.

公开(公告)号：US11075289B2

公开(公告)日：2021-07-27

申请号：US16525400

申请日：2019-07-29

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Isao Obu ,  Yasunari Umemoto ,  Takayuki Tsutsui ,  Satoshi Tanaka

IPC: H01L29/08 ,  H01L29/73 ,  H01L29/205 ,  H01L29/417 ,  H01L29/737 ,  H01L21/8252 ,  H01L21/285 ,  H01L21/306 ,  H01L21/308 ,  H01L29/66 ,  H01L27/082 ,  H03F3/24 ,  H03F1/56

Abstract: A first sub-collector layer functions as an inflow path of a collector current that flows in a collector layer of a heterojunction bipolar transistor. A collector ballast resistor layer having a lower doping concentration than the first sub-collector layer is disposed between the collector layer and the first sub-collector layer.

公开(公告)号：US11018639B2

公开(公告)日：2021-05-25

申请号：US16382324

申请日：2019-04-12

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Takayuki Tsutsui ,  Masao Kondo ,  Satoshi Tanaka

IPC: H03F1/30 ,  H03F3/24 ,  H03F3/21 ,  H03F3/19 ,  H03F3/193 ,  H03F3/04

Abstract: A power amplifier circuit includes a first transistor that amplifies a first signal and outputs a second signal; a second transistor that amplifies the second signal and outputs a third signal; a bias circuit that supplies a bias current to a base of the second transistor; and a bias adjustment circuit that adjusts the bias current to be supplied by the bias circuit by subjecting the first signal to detection. The bias adjustment circuit controls the bias current to be supplied to the base of the second transistor by drawing, from the bias circuit, a current of a magnitude corresponding to a magnitude of the first signal. The current increases as the magnitude of the first signal increases.

公开(公告)号：US10825785B2

公开(公告)日：2020-11-03

申请号：US16157469

申请日：2018-10-11

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Hisanori Namie ,  Satoshi Goto ,  Satoshi Tanaka

IPC: H03F3/191 ,  H01L23/66 ,  H01L23/00 ,  H03F3/195 ,  H03F1/56 ,  H03F3/213 ,  H01L27/06 ,  H01L29/735 ,  H01L29/73

Abstract: A semiconductor device includes a semiconductor substrate, a transistor, and a first harmonic termination circuit. The transistor is formed at the semiconductor substrate. The transistor amplifies an input signal supplied to an input end and outputs an amplified signal through an output end. The first harmonic termination circuit attenuates a harmonic component included in the amplified signal. The first harmonic termination circuit is formed at the semiconductor substrate such that one end of the first harmonic termination circuit is connected to the output end of the transistor and the other end of the first harmonic termination circuit is connected to a ground end of the transistor.

公开(公告)号：US10819286B2

公开(公告)日：2020-10-27

申请号：US16205904

申请日：2018-11-30

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Satoshi Tanaka ,  Tetsuaki Adachi ,  Kazuo Watanabe ,  Masahito Numanami ,  Yasuhisa Yamamoto

IPC: H03K5/22 ,  H03F1/02 ,  H03F3/191 ,  H03F1/56 ,  H03F3/193 ,  H03F3/21

Abstract: Provided is a power amplification circuit that includes: an amplifier that amplifies an input signal and outputs an amplified signal; a first bias circuit that supplies a first bias current or voltage to the amplifier; a second bias circuit that supplies a second bias current or voltage to the amplifier; a first control circuit that controls the first bias current or voltage; and a second control circuit that controls the second bias current or voltage. The current supplying capacity of the first bias circuit is different from the current supplying capacity of the second bias circuit.

公开(公告)号：US10804955B2

公开(公告)日：2020-10-13

申请号：US16788625

申请日：2020-02-12

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Satoshi Sakurai ,  Satoshi Arayashiki ,  Satoshi Tanaka ,  Kyoichi Hirayama ,  Tomohito Ito ,  Kenta Kurahashi

IPC: H04B1/48 ,  H04B1/00

Abstract: A high-frequency module includes a transmission signal amplifier that outputs a transmission signal to an antenna terminal side; a reception signal amplifier that amplifies a reception signal supplied from an antenna terminal; a switch that selectively connects the antenna terminal to either an output of the transmission signal amplifier or an input of the reception signal amplifier; and a directional coupler that is provided on a transmission signal path and detects a signal level of the transmission signal. The transmission signal amplifier is controlled by a first control signal supplied from a first control circuit. The reception signal amplifier is controlled by a second control signal supplied from a second control circuit. The switch is controlled by a switch control signal supplied from the first control circuit. The directional coupler is controlled by a coupler control signal supplied from the first control circuit.

公开(公告)号：US20200304071A1

公开(公告)日：2020-09-24

申请号：US16898156

申请日：2020-06-10

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Satoshi Tanaka ,  Masatoshi HASE ,  Norio HAYASHI ,  Kazuo WATANABE ,  Yuuri HONDA

IPC: H03F1/02 ,  H03F3/21 ,  H03F1/56 ,  H03F3/19 ,  H03F3/24 ,  H03F3/195

Abstract: A power amplifier circuit includes an amplifier that receives an input signal with an alternating current and outputs an output signal obtained by amplifying power of the input signal to a first node; an inductive element that is connected between the first node and a second node; and a variable capacitor that is connected between the second node and a reference potential, and whose electrostatic capacitance increases as power of the output signal increases.