公开(公告)号：US20200186094A1

公开(公告)日：2020-06-11

申请号：US16789827

申请日：2020-02-13

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Masao KONDO ,  Hidetoshi MATSUMOTO

IPC: H03F1/02 ,  H03F3/21 ,  H03F3/24 ,  H03F3/19

Abstract: A power amplifier module includes an amplifier transistor and a bias circuit. A first power supply voltage based on a first operation mode or a second power supply voltage based on a second operation mode is supplied to the amplifier transistor. The amplifier transistor receives a first signal and outputs a second signal obtained by amplifying the first signal. The bias circuit supplies a bias current to the amplifier transistor. The bias circuit includes first and second resistors and first and second transistors. The first transistor is connected in series with the first resistor and is turned ON by a first bias control voltage which is supplied when the first operation mode is used. The second transistor is connected in series with the second resistor and is turned ON by a second bias control voltage which is supplied when the second operation mode is used.

公开(公告)号：US20190199298A1

公开(公告)日：2019-06-27

申请号：US16217506

申请日：2018-12-12

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Kiichiro TAKENAKA ,  Masahiro ITO ,  Tsuyoshi SATO ,  Kozo SATO ,  Hidetoshi MATSUMOTO

IPC: H03F1/56 ,  H03F3/21 ,  H03F3/195 ,  H03F3/45 ,  H03H7/38

Abstract: A matching network is a matching network of a power amplifier circuit that outputs a signal obtained by a differential amplifier amplifying power of a high-frequency signal. The matching network includes an input-side winding connected between differential outputs of the differential amplifier; an output-side winding that is coupled to the input-side winding via an electromagnetic field and whose one end is connected to a reference potential; a first LC series resonant circuit including a capacitive element and an inductive element connected in series with each other, and being connected in parallel with the input-side winding; and a second LC series resonant circuit including a capacitive element and an inductive element connected in series with each other, and being connected in parallel with the output-side winding.

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.

公开(公告)号：US20190253096A1

公开(公告)日：2019-08-15

申请号：US16267691

申请日：2019-02-05

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Tsuyoshi SATO ,  Hidetoshi MATSUMOTO ,  Kiichiro TAKENAKA ,  Masahiro ITO ,  Satoshi TANAKA

IPC: H04B1/40 ,  H04B1/00

CPC classification number: H04B1/40 ,  H04B1/0057 ,  H04B1/006 ,  H04B1/0067

Abstract: First to fourth circuits are connected to corresponding first to fourth antenna terminals. The first to fourth circuits transmit and receive a signal of TDD and a signal of FDD. The first to fourth circuits transmit and receive a signal of MIMO. The third circuit receives a signal of a satellite positioning system. The lower limit of the frequency of the signal received by the third circuit and the fourth circuit is higher than the lower limit of the frequency of the signal received by the first circuit and the second circuit.

公开(公告)号：US20200212855A1

公开(公告)日：2020-07-02

申请号：US16720308

申请日：2019-12-19

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Yuuma NOGUCHI ,  Hidetoshi MATSUMOTO ,  Kiichiro TAKENAKA ,  Satoshi TANAKA

IPC: H03F3/24 ,  H03F1/02

Abstract: A power supply circuit supplies a variable voltage to a power amplifier that amplifies a radio-frequency signal, and includes a transistor and a current detecting resistor. The transistor includes a collector or drain that is supplied with a fixed voltage from a fixed voltage source, a base or gate that receives an envelope signal tracking an envelope of the radio-frequency signal, and an emitter or source that outputs the variable voltage that is based on the envelope signal. The current detecting resistor is electrically connected between the fixed voltage source and the collector or drain of the transistor.

公开(公告)号：US20190253086A1

公开(公告)日：2019-08-15

申请号：US16274391

申请日：2019-02-13

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Tsuyoshi SATO ,  Hidetoshi MATSUMOTO ,  Kiichiro TAKENAKA ,  Masahiro ITO ,  Satoshi TANAKA

IPC: H04B1/00 ,  H04J3/22

Abstract: A high-frequency-signal transceiver circuit transmits and receives a signal between first to sixth antenna terminals and terminals near a high-frequency circuit. The high-frequency-signal transceiver circuit includes first to sixth circuits connected to the corresponding first to sixth antenna terminals. One of the first to sixth circuits transmits and receives only a signal of time division multiplexing communication.