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公开(公告)号：US11245365B2
公开(公告)日：2022-02-08
申请号：US16828630
申请日：2020-03-24
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Toshikazu Terashima , Satoshi Tanaka , Kazuo Watanabe , Makoto Itou , Jun Enomoto
Abstract: A power amplifier circuit includes a first transistor, a capacitor, and a second transistor. The first transistor has an emitter electrically connected to a reference potential, a base, and a collector electrically connected to a first power supply potential. A first end of the capacitor is electrically connected to the collector of the first transistor. The second transistor has an emitter electrically connected to a second end of the capacitor and electrically connected to the reference potential, a base, and a collector electrically connected to the first power supply potential. An RF output signal obtained by amplifying the RF input signal is output from the collector of the second transistor. A second bias circuit includes a third transistor having a collector electrically connected to a second power supply potential, a base, and an emitter from which the second bias current or voltage is output.
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公开(公告)号：US10965325B2
公开(公告)日：2021-03-30
申请号：US16285584
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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公开(公告)号：US20200304070A1
公开(公告)日：2020-09-24
申请号：US16897102
申请日：2020-06-09
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Kazuo Watanabe , Satoshi Tanaka , Norio Hayashi , Kazuma Sugiura
Abstract: The present disclosure is to improve the power added efficiency of a power amplifier at high output power. The power amplifier includes: a first capacitor with a radio frequency signal input to one end thereof; a first transistor whose base is connected to the other end of the first capacitor to amplify the radio frequency signal; a bias circuit for supplying bias to the base of the first transistor; and a second capacitor with one end connected to the base of the first transistor and the other end connected to the emitter of the first transistor.
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公开(公告)号：US10715084B2
公开(公告)日：2020-07-14
申请号：US16136359
申请日：2018-09-20
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Satoshi Tanaka , Masatoshi Hase , Norio Hayashi , Kazuo Watanabe , Yuuri Honda
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.
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公开(公告)号：US10389307B2
公开(公告)日：2019-08-20
申请号：US16001658
申请日：2018-06-06
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Satoshi Tanaka , Masatoshi Hase , Yuri Honda , Kazuo Watanabe , Takashi Soga
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.
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Patent Agency Ranking
公开(公告)号：US10256849B2
公开(公告)日：2019-04-09
申请号：US15490073
申请日：2017-04-18
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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公开(公告)号：US20190089307A1
公开(公告)日：2019-03-21
申请号：US16136359
申请日：2018-09-20
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Satoshi Tanaka , Masatoshi Hase , Norio Hayashi , Kazuo Watanabe , Yuuri Honda
CPC classification number: H03F1/0205 , H03F1/565 , H03F3/19 , H03F3/195 , H03F3/21 , H03F3/245 , H03F2200/387 , H03F2200/451
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.
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公开(公告)号：US11784609B2
公开(公告)日：2023-10-10
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
CPC classification number: H03F1/0205 , H03F1/565 , H03F3/19 , H03F3/195 , H03F3/21 , H03F3/245 , H03F2200/387 , H03F2200/451
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.
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公开(公告)号：US11606066B2
公开(公告)日：2023-03-14
申请号：US17195770
申请日：2021-03-09
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：US11387796B2
公开(公告)日：2022-07-12
申请号：US16709262
申请日：2019-12-10
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Satoshi Tanaka , Kazuo Watanabe , Norio Hayashi , Makoto Itou
Abstract: A power amplifier circuit includes a lower-stage transistor having a first power supply voltage supplied to a first terminal, a second terminal connected to ground, and a first signal supplied to a third terminal; an upper-stage transistor having a second power supply voltage supplied to a first terminal, a second signal obtained by amplifying the first signal being output from the first terminal, a second terminal connected to the first terminal of the lower-stage transistor via a first capacitor, and a third terminal connected to ground via a ground path; an inductor that connects the second terminal of the upper-stage transistor to ground; and an adjustment circuit that adjusts impedance seen from the third terminal of the upper-stage transistor. The adjustment circuit includes a second capacitor and at least one resistance element connected in series with the ground path between the third terminal of the upper-stage transistor and ground.
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