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公开(公告)号：US10374561B2
公开(公告)日：2019-08-06
申请号：US15914674
申请日：2018-03-07
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Makoto Tabei , Daisuke Watanabe
Abstract: Provided is an amplification circuit that amplifies an input signal and outputs an amplified signal. The amplification circuit includes: an amplification element that outputs the amplified signal from an output terminal thereof; an inductor having one end to which a power supply voltage is supplied and another end that is connected to the output terminal of the amplification element; a variable resistor that is connected in parallel with the inductor; and a resistance value adjusting circuit that adjusts a resistance value of the variable resistor in accordance with the temperature.
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公开(公告)号：US20170359046A1
公开(公告)日：2017-12-14
申请号：US15618446
申请日：2017-06-09
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Ken Wakaki , Daisuke Watanabe
CPC classification number: H03G3/3042 , H03F1/223 , H03F1/56 , H03F3/193 , H03F2200/222 , H03F2200/294 , H03F2200/318 , H03F2200/387 , H03F2200/451 , H03F2200/61 , H03G1/0023 , H03G1/0035 , H03G1/0088 , H03G3/3052 , H03G2201/106
Abstract: An amplifier according to an embodiment of the present invention includes a first transistor and a second transistor that are connected between a ground point and a power supply. A control terminal of the first transistor is connected to an input terminal. A first terminal of the first transistor is connected to the ground point. A second terminal of the second transistor is connected to an output terminal. The amplifier further includes an impedance element and a variable resistance unit. The impedance element is connected between the second terminal of the second transistor and the power supply. The variable resistance unit is connected between the second terminal of the first transistor and the first terminal of the second transistor.
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公开(公告)号：US12132449B2
公开(公告)日：2024-10-29
申请号：US17932395
申请日：2022-09-15
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Daisuke Watanabe
CPC classification number: H03F1/22 , H03F1/0205 , H03F3/193 , H03F3/245
Abstract: An amplification circuit includes: a power supply terminal that is connected to a power supply; a transistor that has a source terminal, a drain terminal, and a gate terminal to which a high-frequency signal is input; a transistor that has a source terminal that is connected to the drain terminal, a drain terminal that outputs a high-frequency signal, and a gate terminal that is grounded; a capacitor that is serially disposed on a second path that connects the gate terminal and the power supply terminal to each other; and a switch that is serially disposed on a first path or the second path. The drain terminal and the gate terminal are connected to each other via the switch and the capacitor.
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公开(公告)号：US11362644B2
公开(公告)日：2022-06-14
申请号：US17167482
申请日：2021-02-04
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：US11342891B2
公开(公告)日：2022-05-24
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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Patent Agency Ranking
公开(公告)号：US11271534B2
公开(公告)日：2022-03-08
申请号：US16892657
申请日：2020-06-04
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Daisuke Watanabe , Takayuki Tomita
Abstract: A variable gain circuit includes: input/output terminals P1 and P2 configured to input/output a high frequency signal; a transistor having a signal terminal “a” connected to the input/output terminal P1, a signal terminal “b” connected to the input/output terminal P2, and a control terminal; bias terminals B1, B2 and B3, and a reference voltage terminal respectively set to a first variable voltage, a second variable voltage, a third variable voltage, and a fixed voltage that are independent of one another; an impedance element connected between the bias terminal B1 and the signal terminal a; an impedance element connected between the bias terminal B2 and the signal terminal b; an impedance element connected between the bias terminal B3 and the control terminal; and a first switch configured to switch between connecting and not connecting the reference voltage terminal and the control terminal.
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公开(公告)号：US10110176B2
公开(公告)日：2018-10-23
申请号：US15586741
申请日：2017-05-04
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Daisuke Watanabe , Ken Wakaki
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. 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：US20170366145A1
公开(公告)日：2017-12-21
申请号：US15586741
申请日：2017-05-04
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. 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：US11469718B2
公开(公告)日：2022-10-11
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：US11283413B2
公开(公告)日：2022-03-22
申请号：US16554887
申请日：2019-08-29
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Daisuke Watanabe , Takayuki Tomita
Abstract: An amplification circuit includes a filter circuit, an amplifier, a capacitor, a bypass line, and a switch circuit that includes a first FET and a second FET connected in series between one end and the other end of the bypass line, a first resistance element connected in series to a gate of the first FET, and a second resistance element connected in series to a gate of the second FET. A first control signal is supplied to the gate of the first FET. A second control signal is supplied to the gate of the second FET. A product of a gate length and a gate width of the first FET and a resistance value of the first resistance element is smaller than a product of a gate length and a gate width of the second FET and a resistance value of the second resistance element.
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