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公开(公告)号：US11043922B2
公开(公告)日：2021-06-22
申请号：US16367750
申请日：2019-03-28
发明人： Daisuke Watanabe
摘要： 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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公开(公告)号：US10944382B2
公开(公告)日：2021-03-09
申请号：US16849044
申请日：2020-04-15
发明人： Takayuki Tomita , Daisuke Watanabe
摘要： 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：US20180198429A1
公开(公告)日：2018-07-12
申请号：US15914674
申请日：2018-03-07
发明人： Makoto Tabei , Daisuke Watanabe
CPC分类号： H03G1/0035 , H03F1/223 , H03F1/301 , H03F1/56 , H03F1/565 , H03F3/193 , H03F3/245 , H03F2200/18 , H03F2200/222 , H03F2200/294 , H03F2200/301 , H03F2200/387 , H03F2200/447 , H03F2200/451 , H03F2200/492
摘要： 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：US20180034426A1
公开(公告)日：2018-02-01
申请号：US15639397
申请日：2017-06-30
发明人： Makoto Tabei , Daisuke Watanabe
CPC分类号： H03G1/0035 , H03F1/223 , H03F1/301 , H03F1/56 , H03F1/565 , H03F3/193 , H03F3/245 , H03F2200/18 , H03F2200/222 , H03F2200/294 , H03F2200/301 , H03F2200/387 , H03F2200/447 , H03F2200/451 , H03F2200/492
摘要： 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：US11329630B2
公开(公告)日：2022-05-10
申请号：US16849076
申请日：2020-04-15
发明人： Takayuki Tomita , Daisuke Watanabe
摘要： 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：US10707909B2
公开(公告)日：2020-07-07
申请号：US16126542
申请日：2018-09-10
发明人： Daisuke Watanabe
IPC分类号： H01Q1/24 , H04B1/18 , H01Q5/328 , H03F3/189 , H01Q15/00 , H03F3/195 , H03F3/24 , H04B1/04 , H04B1/48 , H01Q1/50
摘要： 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：US10270411B2
公开(公告)日：2019-04-23
申请号：US15618446
申请日：2017-06-09
发明人： Ken Wakaki , Daisuke Watanabe
摘要： 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：US09948255B2
公开(公告)日：2018-04-17
申请号：US15639397
申请日：2017-06-30
发明人： Makoto Tabei , Daisuke Watanabe
CPC分类号： H03G1/0035 , H03F1/223 , H03F1/301 , H03F1/56 , H03F1/565 , H03F3/193 , H03F3/245 , H03F2200/18 , H03F2200/222 , H03F2200/294 , H03F2200/301 , H03F2200/387 , H03F2200/447 , H03F2200/451 , H03F2200/492
摘要： 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：US11664768B2
公开(公告)日：2023-05-30
申请号：US17325350
申请日：2021-05-20
发明人： Daisuke Watanabe
CPC分类号： H03F1/22 , H03F1/0205 , H03F3/193 , H03F3/245
摘要： 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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公开(公告)号：US10673395B2
公开(公告)日：2020-06-02
申请号：US16138047
申请日：2018-09-21
发明人： Daisuke Watanabe , Ken Wakaki
摘要： 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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