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公开(公告)号：US11381204B2
公开(公告)日：2022-07-05
申请号：US16671626
申请日：2019-11-01
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Hisanori Namie , Mitsunori Samata , Satoshi Tanaka
Abstract: A power amplifier circuit includes a first amplifier that amplifies a first signal, and a second amplifier arranged subsequent to the first amplifier. The second amplifier amplifies a second signal that is based on an output signal of the first amplifier. The first amplifier performs class inverse-F operation, and the second amplifier performs class F operation.
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公开(公告)号：US11336234B2
公开(公告)日：2022-05-17
申请号：US16829776
申请日：2020-03-25
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Takashi Yamada , Yuuri Honda , Satoshi Tanaka
Abstract: A power amplifier circuit includes a power amplifier that amplifies an input signal and outputs the amplified signal from an output terminal thereof, a first filter circuit that has a frequency characteristic that attenuates an Nth-order harmonic of the amplified signal, N that is an integer greater than or equal to 2, and a second filter circuit that has a frequency characteristic that attenuates the Nth-order harmonic of the amplified signal. The first filter circuit includes a first capacitor and a first inductor. The first capacitor and the first inductor are connected in series between the output terminal and ground. The second filter circuit includes a second capacitor and a second inductor. The second capacitor and the second inductor are connected in series between the output terminal and ground.
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公开(公告)号：US11309852B2
公开(公告)日：2022-04-19
申请号：US16995902
申请日：2020-08-18
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Isao Obu , Satoshi Tanaka , Takayuki Tsutsui , Yasunari Umemoto
Abstract: A power amplifier includes initial-stage and output-stage amplifier circuits, and initial-stage and output-stage bias circuits. The initial-stage amplifier circuit includes a first high electron mobility transistor having a source electrically connected to a reference potential, and a gate to which a radio-frequency input signal is inputted, and a first heterojunction bipolar transistor having an emitter electrically connected to a drain of the first high electron mobility transistor, a base electrically connected to the reference potential in an alternate-current fashion, and a collector to which direct-current power is supplied and from which a radio-frequency signal is outputted. The output-stage amplifier circuit includes a second heterojunction bipolar transistor having an emitter electrically connected to the reference potential, a base to which the radio-frequency signal outputted from the first heterojunction bipolar transistor is inputted, and a collector to which direct-current power is supplied and from which a radio-frequency output signal is outputted.
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公开(公告)号：US11302659B2
公开(公告)日：2022-04-12
申请号：US17038895
申请日：2020-09-30
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.
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公开(公告)号：US11177841B2
公开(公告)日：2021-11-16
申请号：US16926338
申请日：2020-07-10
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Atsushi Ono , Satoshi Tanaka , Hirotsugu Mori
Abstract: A radio-frequency circuit is used in simultaneous transfer of a radio-frequency signal of 4G and a radio-frequency signal of 5G, and includes a first transfer circuit that receives the radio-frequency signal of 4G or the radio-frequency signal of 5G which are input in a switching manner, and transfers a radio-frequency signal of a first communication band including a first transmission band and a first reception band and a radio-frequency signal of a second communication band including a second transmission band and a second reception band. The first and second transmission bands at least partially overlap. The first transfer circuit includes a first power amplifier that amplifies transmission signals of the first and second communication bands, and a first transmission filter that has a first passband including the first and second transmission bands, and passes the transmission signals of the first and second communication bands output from the first power amplifier.
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Patent Agency Ranking
公开(公告)号：US11114989B2
公开(公告)日：2021-09-07
申请号：US16694025
申请日：2019-11-25
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Satoshi Goto , Hideyuki Satou , Satoshi Tanaka
Abstract: A power amplifying circuit includes an amplifier that amplifies a radio-frequency signal and a bypass capacitor section connected to a power supply terminal for supplying a power supply voltage to the amplifier. The bypass capacitor section includes a first capacitor, a second capacitor, and a first switch circuit. The first capacitor includes a first end connected to a power supply path, and a second end. The second capacitor includes a first end connected to the second end of the first capacitor and a second end connected to ground. The first switch circuit includes a first terminal connected to the second end of the first capacitor and the first end of the second capacitor, and a second terminal connected to the ground. The first switch circuit switches between connection and non-connection between the second end of the first capacitor and the ground.
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公开(公告)号：US10985715B2
公开(公告)日：2021-04-20
申请号：US16549057
申请日：2019-08-23
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Satoshi Tanaka , Kazuo Watanabe , Yusuke Tanaka , Satoshi Arayashiki
Abstract: A power amplifier circuit includes a lower transistor having a first terminal, a second terminal connected to ground, and a third terminal, wherein a first power supply voltage is supplied to the first terminal, and an input signal is supplied to the third terminal; a first capacitor; an upper transistor having a first terminal, a second terminal connected to the first terminal of the lower transistor via the first capacitor, and a third terminal, wherein a second power supply voltage is supplied to the first terminal, an amplified signal is outputted to an output terminal from the first terminal, and a driving voltage is supplied to the third terminal; a first inductor that connects the second terminal of the upper transistor to ground; a voltage regulator circuit; and at least one termination circuit that short-circuits an even-order harmonic or odd-order harmonic of the amplified signal to ground potential.
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公开(公告)号：US10979004B2
公开(公告)日：2021-04-13
申请号：US16794841
申请日：2020-02-19
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Yuri Honda , Fumio Harima , Satoshi Tanaka
Abstract: A power amplifier circuit includes an amplifier transistor having a base, a collector, a bias circuit, and a first resistance element connected between the base of the amplifier transistor and the bias circuit. The bias circuit includes a voltage generation circuit, a first transistor having a base to which a first direct-current voltage is supplied, and an emitter from which the bias current or voltage is supplied, a second transistor having a base to which a second direct-current voltage is supplied, and an emitter connected to the emitter of the first transistor, a signal supply circuit disposed between the base of the amplifier transistor and the base of the second transistor, and an impedance circuit disposed between the base of the first transistor and the base of the second transistor.
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公开(公告)号：US10972051B2
公开(公告)日：2021-04-06
申请号：US16538932
申请日：2019-08-13
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Satoshi Tanaka , Satoshi Arayashiki , Kazuo Watanabe
Abstract: A power amplifier circuit includes a first amplifier that amplifies an input signal and outputs an output signal; a second amplifier that, in accordance with a control signal, amplifies a signal corresponding to the input signal, generates a signal having an opposite phase to that of the output signal, and adds the signal to the output signal; and a control circuit that supplies the control signal to the second amplifier. The control circuit outputs the control signal so that during operation of the power amplifier circuit in a first power mode, a gain of the second amplifier is not less than zero and less than a predetermined level and during operation in a second power mode lower than the first power mode in output power level, a gain of the second amplifier is not less than the predetermined level and less than a gain of the first amplifier.
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公开(公告)号：US10944438B2
公开(公告)日：2021-03-09
申请号：US16285408
申请日：2019-02-26
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Satoshi Tanaka , Kazuo Watanabe , Tetsuaki Adachi , Masahito Numanami , Yasuhisa Yamamoto
Abstract: A communication unit includes the following elements. A first transmit circuit outputs a first signal or a second signal from a first input signal. A first amplifier amplifies the first signal and outputs a first amplified signal. A first signal generating circuit generates a third signal having a frequency higher than a frequency of the second signal, based on the second signal and a first reference signal. A first filter circuit receives the third signal and allows one of a frequency component representing a sum of the frequency of the second signal and a frequency of the first reference signal and a frequency component representing a difference therebetween to pass through the first filter circuit and attenuates the other one of the frequency components. A second amplifier amplifies the third signal output from the first filter circuit and outputs a second amplified signal.
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