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    HIGH-FREQUENCY SIGNAL PROCESSING APPARATUS AND WIRELESS COMMUNICATION APPARATUS
    21.
    发明申请
    HIGH-FREQUENCY SIGNAL PROCESSING APPARATUS AND WIRELESS COMMUNICATION APPARATUS 审中-公开

    公开(公告)号：US20200154368A1

    公开(公告)日：2020-05-14

    申请号：US16744852

    申请日：2020-01-16

    Applicant: Murata Manufacturing Co., Ltd.

    Inventor： Satoshi TANAKA ,  Kiichiro TAKENAKA ,  Takayuki TSUTSUI ,  Taizo YAMAWAKI ,  Shun IMAI

    IPC: H04W52/24 ,  H03F3/21 ,  H03F1/02 ,  H03F3/19 ,  H04W52/02 ,  H04B1/04 ,  H03F3/24 ,  H03F3/189

    Abstract: A high-frequency signal processing apparatus and a wireless communication apparatus can achieve a decrease in power consumption. For example, when an indicated power level to a high-frequency power amplifier is equal to or greater than a second reference value, envelope tracking is performed by causing a source voltage control circuit to control a high-speed DCDC converter using a detection result of an envelope detecting circuit and causing a bias control circuit to indicate a fixed bias value. The source voltage control circuit and the bias control circuit indicate a source voltage and a bias value decreasing in proportion to a decrease in the indicated power level when the indicated power level is in a range of the second reference value to the first reference value, and indicate a fixed source voltage and a fixed bias value when the indicated power level is less than the first reference value.

    POWER AMPLIFIER EVALUATION METHOD AND MEASUREMENT SYSTEM
    26.
    发明申请
    POWER AMPLIFIER EVALUATION METHOD AND MEASUREMENT SYSTEM 有权

    公开(公告)号：US20210305950A1

    公开(公告)日：2021-09-30

    申请号：US17209796

    申请日：2021-03-23

    Applicant: Murata Manufacturing Co., Ltd.

    Inventor： Kiichiro TAKENAKA ,  Masahiro ITO ,  Yuuma NOGUCHI ,  Daiji NAGASHIMA ,  Hidetoshi MATSUMOTO

    IPC: H03F3/24

    Abstract: A radio frequency signal having a constant amplitude is modulated by a digital modulation signal and a radio frequency input signal whose amplitude changes stepwise is generated. The radio frequency input signal is input into a power amplifier that is an evaluation target. A period in which an amplitude of the radio frequency input signal is constant is defined as a measurement period and an output signal of the power amplifier is measured in each of measurement periods in which amplitudes of the radio frequency input signal are different from each other.

    ACTIVE BALUN CIRCUIT, POWER AMPLIFIER CIRCUIT, AND POWER AMPLIFIER MODULE
    27.
    发明申请
    ACTIVE BALUN CIRCUIT, POWER AMPLIFIER CIRCUIT, AND POWER AMPLIFIER MODULE 有权

    公开(公告)号：US20210135657A1

    公开(公告)日：2021-05-06

    申请号：US17089766

    申请日：2020-11-05

    Applicant: Murata Manufacturing Co., Ltd.

    Inventor： Takayuki TSUTSUI ,  Satoshi TANAKA ,  Kiichiro TAKENAKA ,  Masatoshi HASE

    IPC: H03H11/32 ,  H03F3/21

    Abstract: An active balun circuit includes first and second transistors having emitters electrically coupled to each other and configured to output differential signals and a circuit element coupled between the connection point of the emitter of the first transistor and the emitter of the second transistor and a reference potential. The impedance of the circuit element at a particular frequency of the input signal appears significantly larger than impedances at other frequencies. An input signal from an input terminal is inputted to the base of the first transistor. The reference potential is applied to the base of the second transistor. A supply voltage is applied to the collector of the first transistor and the collector of the second transistor. A signal from the collector of the first transistor and a signal from the collector of the second transistor are outputted as the differential signals.

    TRANSMISSION UNIT
    28.
    发明申请
    TRANSMISSION UNIT 审中-公开

    公开(公告)号：US20190181892A1

    公开(公告)日：2019-06-13

    申请号：US16211940

    申请日：2018-12-06

    Applicant: Murata Manufacturing Co., Ltd.

    Inventor： Kiichiro TAKENAKA

    IPC: H04B1/04 ,  H04W52/02 ,  H04W52/36

    Abstract: A transmission unit includes: a power amplification module that amplifies the power of an input signal and outputs an amplified signal; and a power supply module that supplies a power supply voltage to the power amplification module on the basis of a first control signal corresponding to the band width of the input signal. On the basis of the first control signal, the power supply module varies the power supply voltage in accordance with the amplitude level of the input signal in the case where the band width of the input signal is a first band width and varies the power supply voltage in accordance with the average output power of the power amplification module in the case where the band width of the input signal is a second band width that is larger than the first band width.

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