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    HIGH FREQUENCY CIRCUIT AND COMMUNICATION DEVICE
    1.
    发明申请
    HIGH FREQUENCY CIRCUIT AND COMMUNICATION DEVICE 有权

    公开(公告)号：US20250023588A1

    公开(公告)日：2025-01-16

    申请号：US18900951

    申请日：2024-09-30

    Applicant: Murata Manufacturing Co., Ltd.

    Inventor： Kenji TAHARA ,  Kae YAMAMOTO

    IPC: H04B1/00 ,  H03F3/24 ,  H04L5/14

    Abstract: A high frequency circuit includes power amplifiers, filters including a band A in their pass bands, filters including a band B in their pass bands, and a switch circuit that switches the connection between an antenna terminal and two terminals and switches the connection between another antenna terminal and two other terminals. The output end of one power amplifier is connected to the input ends of two of the filters, the output end of one filter is connected to one of the terminals, the output end of another filter is connected to another terminal, the output end of the other power amplifier is connected to the input ends of two others of the filters, the output end of one of the other filters is connected to one of the other terminals, and the output end of another of the other filters is connected to another of the other terminals.

    RADIO-FREQUENCY CIRCUIT AND COMMUNICATION DEVICE
    3.
    发明申请
    RADIO-FREQUENCY CIRCUIT AND COMMUNICATION DEVICE 有权

    公开(公告)号：US20220311455A1

    公开(公告)日：2022-09-29

    申请号：US17805498

    申请日：2022-06-06

    Applicant: Murata Manufacturing Co., Ltd.

    Inventor： Kenji TAHARA ,  Takahiro EGUCHI ,  Hiroyuki NAGAMORI

    IPC: H04B1/00

    Abstract: The sensitivity of a reception filter for receiving a reception signal in a second frequency band corresponding to the 4G or 5G standard is prevented from being degraded by a harmonic of a third transmission signal in a third frequency region corresponding to the 4G or 5G standard. A radio-frequency circuit includes an antenna terminal, a relay terminal, a transmission filter, a reception filter, a variable low-pass filter, and a switch. A first transmission signal in a first frequency band is input to the relay terminal. In communication using the first frequency band, the variable low-pass filter passes the first transmission signal input via the relay terminal. When another harmonic circuit performs communication using the third frequency band, the variable low-pass filter attenuates, among harmonics of the third transmission signal in the third frequency band, a harmonic input via the relay terminal.

    RADIO FREQUENCY MODULE AND COMMUNICATION DEVICE
    5.
    发明申请
    RADIO FREQUENCY MODULE AND COMMUNICATION DEVICE 有权

    公开(公告)号：US20220239318A1

    公开(公告)日：2022-07-28

    申请号：US17658705

    申请日：2022-04-11

    Applicant: Murata Manufacturing Co., Ltd.

    Inventor： Kenji TAHARA ,  Toshiki MATSUI

    IPC: H04B1/00 ,  H03H7/46 ,  H04B1/04 ,  H04B1/401 ,  H04B1/48

    Abstract: A radio frequency module includes a transmit filter of Band A and Band B, a transmit amplifier, and a switch circuit and can perform CA using a transmit signal of Band A and a receive signal of Band B, a transmit band of Band B including a receive band of Band C. The switch circuit includes a switch switching connection between a common terminal and a first selection terminal, a switch switching connection between the common terminal and a second selection terminal, and a switch switching connection between the second selection terminal and a third selection terminal. The common terminal is connected to the transmit amplifier. The first selection terminal is connected to the transmit filter of Band A. The second selection terminal is connected to the transmit filter of Band B. The third selection terminal is connected to a receive path of Band C.

    POWER AMPLIFIER
    6.
    发明申请
    POWER AMPLIFIER 审中-公开

    公开(公告)号：US20200244233A1

    公开(公告)日：2020-07-30

    申请号：US16750234

    申请日：2020-01-23

    Applicant: Murata Manufacturing Co., Ltd.

    Inventor： Kenji TAHARA ,  Yoshiaki SUKEMORI

    IPC: H03F3/21 ,  H03F1/02 ,  H03F3/60

    Abstract: A power amplifier includes an amplifier circuit group including multiple amplifier circuits, a distributing circuit that distributes an input signal to each of the multiple amplifier circuits, and a combining circuit that combines output signals from the multiple amplifier circuits. Each of the multiple amplifier circuits includes an amplifier transistor including multiple cell transistors having different sizes and bias circuits that supply bias current to the respective cell transistors.

    FILTER CIRCUIT AND RADIO-FREQUENCY MODULE
    7.
    发明申请
    FILTER CIRCUIT AND RADIO-FREQUENCY MODULE 审中-公开

    公开(公告)号：US20200220635A1

    公开(公告)日：2020-07-09

    申请号：US16822838

    申请日：2020-03-18

    Applicant: Murata Manufacturing Co., Ltd.

    Inventor： Kenji TAHARA ,  Shou MATSUMOTO

    IPC: H04J1/04 ,  H04B1/56 ,  H04B1/52

    Abstract: A filter circuit includes a first switch circuit that exclusively connects a first common terminal to either of a first selection terminal and a second selection terminal; a first signal terminal that is connected to the first selection terminal and that is for communicating a first communication signal belonging to a first frequency range, which is a frequency range of a first communication band; a second signal terminal that is connected to the second selection terminal and that is for communicating a second communication signal belonging to a second frequency range, which is the frequency range of a second communication band and which is at least partially overlapped with the first frequency range; and a first band pass filter one end of which is connected to the first common terminal and which uses both the first frequency range and the second frequency range as pass bands.

    POWER AMPLIFICATION CIRCUIT
    8.
    发明申请
    POWER AMPLIFICATION CIRCUIT 审中-公开

    公开(公告)号：US20190305736A1

    公开(公告)日：2019-10-03

    申请号：US16296754

    申请日：2019-03-08

    Applicant: Murata Manufacturing Co., Ltd.

    Inventor： Kenji TAHARA ,  Kenichi SHIMAMOTO ,  Shigeru TSUCHIDA ,  Mitsunori SAMATA ,  Yoshiaki SUKEMORI

    IPC: H03F3/24 ,  H03F3/195

    Abstract: A power amplification circuit includes an amplification transistor, a variable voltage power supply that supplies a variable voltage to a collector of the amplification transistor, a bias circuit that has a constant current amplification transistor outputting a DC bias current to a base of the amplifier transistor, and a current limiting circuit that limits the DC bias current. The current limiting circuit includes a current limiting transistor, a resistor element connected to a collector of the current limiting transistor and the variable voltage power supply, and a resistor element connected to a base of the current limiting transistor and a base of the constant current amplifying transistor.

    HIGH FREQUENCY CIRCUIT AND COMMUNICATION APPARATUS
    9.
    发明申请
    HIGH FREQUENCY CIRCUIT AND COMMUNICATION APPARATUS 有权

    公开(公告)号：US20240405732A1

    公开(公告)日：2024-12-05

    申请号：US18804088

    申请日：2024-08-14

    Applicant: Murata Manufacturing Co., Ltd.

    Inventor： Kenji TAHARA ,  Kae YAMAMOTO

    IPC: H03F3/21 ,  H03F1/02 ,  H03F1/56 ,  H03F3/213 ,  H04B1/00 ,  H04B1/04

    Abstract: A high frequency circuit includes a signal input terminal and a signal output terminal; a first amplifier, a second amplifier, a third amplifier, and a fourth amplifier; and a first phase shift circuit. An input terminal of the fourth amplifier is connected to the signal input terminal, an output terminal of the fourth amplifier is connected to an input terminal of the first amplifier and an input terminal of the second amplifier, an output terminal of the second amplifier is connected to an input terminal of the third amplifier, an output terminal of the third amplifier is connected to one end of the first phase shift circuit, and the other end of the first phase shift circuit is connected to an output terminal of the first amplifier.

    POWER AMPLIFIER CIRCUIT AND POWER AMPLIFICATION METHOD
    10.
    发明公开
    POWER AMPLIFIER CIRCUIT AND POWER AMPLIFICATION METHOD 审中-公开

    公开(公告)号：US20240146259A1

    公开(公告)日：2024-05-02

    申请号：US18408627

    申请日：2024-01-10

    Applicant: Murata Manufacturing Co., Ltd.

    Inventor： Kenji TAHARA ,  Kae YAMAMOTO

    IPC: H03F3/24

    CPC classification number: H03F3/245 ,  H03F2200/451

    Abstract: A power amplifier circuit includes a power amplifier and an external power terminal that receives a power supply voltage from a power supply circuit. The power amplifier includes two amplifying elements and, a limiter, and an RC circuit. The amplifying elements respectively include first and second input terminals, first and second output terminals, and first and second power terminals. The limiter restricts the power supply voltage to a predetermined range and outputs the restricted power supply voltage. The RC circuit is connected in parallel with the limiter. The first input terminal is connected to an external input terminal. The first output terminal is connected to the second input terminal. The second output terminal is connected to an external output terminal. The first power terminal is connected to the external power terminal via the limiter. The second power terminal is connected to the external power terminal.

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