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公开(公告)号：US20210067104A1
公开(公告)日：2021-03-04
申请号：US17098826
申请日：2020-11-16
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Daisuke WATANABE , Nobuyasu BEPPU
Abstract: An amplifier circuit (1) includes a FET (10) having a source terminal (S1), a drain terminal (D1), and a gate terminal (G1), a FET (20) having a source terminal (S2), a drain terminal (D2), and a gate terminal (G2) and coupled in parallel with the FET (10), a FET (30) having a source terminal (S3) coupled to the drain terminals (D1 and D2), a drain terminal (D3), and a gate terminal (G3) and cascoded with the FETs (10 and 20), and feedback circuits (21 and 22) configured to feed back to the gate terminal (G2) a high frequency signal outputted from the source terminal (S2) or the drain terminal (D2).
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公开(公告)号：US20210058040A1
公开(公告)日：2021-02-25
申请号：US17078189
申请日：2020-10-23
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Makoto TABEI , Ken WAKAKI , Masamichi TOKUDA , Daisuke WATANABE
Abstract: An amplifier circuit amplifies a radio-frequency signal. The amplifier circuit includes an amplifier, an input matching circuit connected to an input side of the amplifier and matches impedance, and a protection circuit connected to a node in a path within a path between an input matching circuit and the amplifier. The protection circuit includes a first diode connected between the node and a ground, and a second diode connected in parallel with the first diode and connected in a direction opposite to the first diode between the node and the ground. A threshold voltage of each of the first diode and the second diode is greater than a maximum voltage amplitude of the input signal at the node and is less than a difference between a withstand voltage of the amplifier and the bias voltage.
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公开(公告)号：US20200244251A1
公开(公告)日：2020-07-30
申请号：US16849076
申请日：2020-04-15
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Takayuki TOMITA , Daisuke WATANABE
Abstract: A switch module includes a first terminal, first and second filters, and first and second switches. Impedance of the first filter for a signal in a stop band is capacitive. When the first switch is turned OFF, impedance of the first switch is capacitive, and impedance of the first filter seen from an end portion of the first switch connected to the first filter is not in a short state and impedance of the first filter seen from the first terminal is in an open state.
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公开(公告)号：US20200244250A1
公开(公告)日：2020-07-30
申请号：US16849044
申请日：2020-04-15
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Takayuki TOMITA , Daisuke WATANABE
Abstract: A switch module includes a first terminal, first and second filters, and first and second switches. Impedance of the first filter for a signal in a stop band is capacitive. When the first switch is turned OFF, impedance of the first switch is capacitive, and impedance of the first filter seen from an end portion of the first switch connected to the first filter is not in a short state and impedance of the first filter seen from the first terminal is in an open state.
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公开(公告)号：US20190305729A1
公开(公告)日：2019-10-03
申请号：US16367750
申请日：2019-03-28
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Daisuke WATANABE
Abstract: An amplification circuit includes: a power supply terminal that is connected to a power supply; a first transistor that has a first source terminal, a first drain terminal, and a first gate terminal to which a high-frequency signal is inputted; a second transistor that has a second source terminal that is connected to the first drain terminal, a second drain terminal that outputs a high frequency signal, and a second gate terminal that is grounded; a capacitor that is serially arranged on a second path that connects the second gate terminal and the power supply terminal; and a switch that is serially arranged on a first path, which connects the second drain terminal and the power supply terminal, or the second path. The second drain terminal and the second gate terminal are connected to each other via the switch and the capacitor.
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Patent Agency Ranking
公开(公告)号：US20240072837A1
公开(公告)日：2024-02-29
申请号：US18449043
申请日：2023-08-14
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Daisuke WATANABE
IPC: H04B1/44
CPC classification number: H04B1/44
Abstract: A radio-frequency module includes low-noise amplifiers, switches, filters, and inductors. The switch includes a common terminal and selection terminals. The filter is connected to the selection terminal. Another filter is connected to another selection terminal. The inductor is connected between the common terminal and an input end of the low-noise amplifier. Another inductor is connected between another filter and an input end of the low-noise amplifier. Another switch is connected between a receive path and ground. The receive path links the common terminal and the input end of the low-noise amplifier to each other. Still another switch is connected between a receive path and ground. The receive path links the filter and the input end of the low-noise amplifier to each other. Still another inductor is connected between the receive path and the receive path.
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公开(公告)号：US20190081651A1
公开(公告)日：2019-03-14
申请号：US16126542
申请日：2018-09-10
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Daisuke WATANABE
Abstract: A radio frequency circuit includes a switching circuit, an amplifying circuit, and a potential stabilizing circuit. The switching circuit includes a switch disposed on a path connecting a first terminal, to which a radio-frequency signal is input, to a second terminal, from which the radio-frequency signal is output, a first capacitor disposed between the first terminal and the switch, and a second capacitor disposed between the switch and the second terminal. The amplifying circuit includes an amplifier disposed between the switching circuit and the second terminal, a third capacitor disposed between the switching circuit and the amplifier, and a fourth capacitor disposed between the amplifier and the second terminal. The potential stabilizing circuit is connected to a first node which is located between the switching circuit and the amplifying circuit and which is located on a path connecting the second capacitor to the third capacitor.
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公开(公告)号：US20190028070A1
公开(公告)日：2019-01-24
申请号：US16138047
申请日：2018-09-21
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Daisuke WATANABE , Ken WAKAKI
CPC classification number: H03F1/565 , H03F1/0205 , H03F3/193 , H03F2200/222 , H03F2200/294 , H03F2200/387
Abstract: An amplifier according to an embodiment of the present disclosure includes a first transistor and a first matching circuit. The first matching circuit is connected between an input terminal and a control terminal of the first transistor. A first terminal of the first transistor is connected to a ground. A second terminal of the first transistor is connected to a power supply and an output terminal. The first matching circuit includes a first inductor, a second inductor, and a first switch. The first inductor has an end connected to the control terminal. The second inductor has an end connected to the other end of the first inductor. The first switch is configured to selectively switch between electrical continuity between the input terminal and the other end of the first inductor and electrical continuity between the input terminal and the other end of the second inductor.
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公开(公告)号：US20140147761A1
公开(公告)日：2014-05-29
申请号：US14170940
申请日：2014-02-03
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Naoki IWAMURA , Hirofumi KAN , Daisuke WATANABE , Hidenori SUZUKI , Shunsuke KIMURA
IPC: H01M8/04
CPC classification number: H01M8/04544 , H01M8/04201 , H01M8/04388 , H01M8/04559 , H01M8/04626 , H01M8/04753 , H01M8/1011 , Y02E60/50 , Y02E60/523
Abstract: A fuel cell has a fuel cell main body, a fuel supply unit, a voltage sensor, a supply speed determining unit, a fuel supply control unit, and a connecting unit. The voltage sensor measures the open-circuit voltage of the fuel cell main body. The supply speed determining unit determines the fuel supply speed of the fuel supply unit, on the basis of the results obtained from the measurement performed by the voltage sensor, in the case where the voltage measured by the voltage sensor is smaller than a predetermined value. The fuel supply control unit controls, on the basis of the supply speed thus determined, the fuel supply from the fuel supply unit. The connecting unit connects a load to the fuel cell main body, in the case where the voltage measured by the voltage sensor is larger than the predetermined value.
Abstract translation: 燃料电池具有燃料电池主体，燃料供给单元，电压传感器，供给速度确定单元，燃料供给控制单元和连接单元。 电压传感器测量燃料电池主体的开路电压。 在由电压传感器测量的电压小于预定值的情况下，供电速度确定单元基于由电压传感器执行的测量获得的结果来确定燃料供应单元的燃料供应速度。 燃料供给控制单元基于如此确定的供给速度来控制来自燃料供给单元的燃料供给。 在由电压传感器测量的电压大于预定值的情况下，连接单元将负载连接到燃料电池主体。
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公开(公告)号：US20230378918A1
公开(公告)日：2023-11-23
申请号：US18309089
申请日：2023-04-28
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Daisuke WATANABE , Naoki MORIKAWA
CPC classification number: H03F3/005 , H03F1/565 , H03H9/64 , H03F3/195 , H03F2200/294
Abstract: An amplifier circuit includes a low noise amplifier disposed in an amplification path, switches connected in series to a bypass path bypassing the low noise amplifier, a capacitor having at least one end connected between the switches in the bypass path, and a switch connected between the bypass path and a ground. The switch connected between the bypass path and the ground is connected between the other switches.
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