公开(公告)号：US11901867B2

公开(公告)日：2024-02-13

申请号：US17350385

申请日：2021-06-17

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Yuri Honda ,  Jun Enomoto ,  Fumio Harima ,  Satoshi Tanaka

IPC: H03F3/45 ,  H03F3/193

CPC classification number: H03F3/45076 ,  H03F3/193 ,  H03F2200/451 ,  H03F2200/534 ,  H03F2200/537 ,  H03F2200/541 ,  H03F2203/45644

Abstract: A differential amplifier circuit includes a first and second amplifiers that output a differential signal in a radio-frequency band, a first inductor having a first end connected to an output end of the first amplifier, a second inductor having a first end connected to an output end of the second amplifier, a choke inductor connected to second ends of the first and second inductors, a first and second capacitors, and a switch that connects the second capacitor in parallel to the first capacitor or terminates a parallel connection of the first and second capacitors. A resonant circuit formed by connecting the first or second inductor in series with the first capacitor has a different resonant frequency from a resonant circuit formed by connecting the first or second inductor in series with the parallel-connected first and second capacitors. These resonant frequencies correspond to second harmonic frequencies of the differential signal.

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

IPC: H03F1/30 ,  H03F1/56 ,  H03F1/02 ,  H03F3/213 ,  H03F3/19

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.

公开(公告)号：US12184245B2

公开(公告)日：2024-12-31

申请号：US17410003

申请日：2021-08-24

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Jun Enomoto ,  Yuri Honda ,  Satoshi Tanaka ,  Fumio Harima

IPC: H03F3/21 ,  H03F1/02 ,  H03F1/56

Abstract: A power amplifier circuit includes: a high pass filter that has one end into which a high frequency input signal is inputted; a first amplifier that amplifies the high frequency input signal outputted from the other end of the high pass filter and outputs a high frequency signal obtained through the first amplification; a second amplifier that amplifies the high frequency signal and outputs a high frequency output signal obtained through the second amplification; an automatic transformer that performs impedance matching between the first amplifier and the second amplifier; and an impedance circuit, one end of which is electrically connected with the other end of the high pass filter, the other end of which is electrically connected with an output terminal of a bias circuit outputting bias voltage or bias current to the first amplifier, and that outputs the high frequency input signal to the bias circuit.

公开(公告)号：US11545944B2

公开(公告)日：2023-01-03

申请号：US17151922

申请日：2021-01-19

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Jun Enomoto ,  Kazuo Watanabe ,  Satoshi Tanaka ,  Yusuke Tanaka ,  Makoto Ito

IPC: H03F1/22 ,  H03F3/24 ,  H03F3/195 ,  H03F1/56

Abstract: A power amplifier circuit includes a power amplifier including a first transistor having a first terminal connected to a reference potential, a second terminal to which a first current and a radio-frequency signal are input, and a third terminal connected to a first power supply potential via a first inductor; a capacitor connected to the third terminal of the first transistor; a second transistor including a first terminal connected to the capacitor and the reference potential via a second inductor, a second terminal to which a second current is input and is connected to the reference potential, and a third terminal connected to the first power supply potential via a third inductor and outputs signal; and an adjustment circuit that outputs a third current corresponding to the first power supply potential or a second power supply potential to the second terminal of the second transistor.

公开(公告)号：US11469715B2

公开(公告)日：2022-10-11

申请号：US17109389

申请日：2020-12-02

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Jun Enomoto ,  Kazuo Watanabe ,  Satoshi Tanaka ,  Yusuke Tanaka ,  Makoto Itou

IPC: H03F1/22 ,  H03F1/32 ,  H03F3/21

Abstract: A power amplifier circuit includes first and second bias circuits configured to provide first and second biases, respectively, a first transistor having an emitter connected to a reference potential, a base configured to receive the first bias via a first resistor and receive a radio-frequency input signal via a first capacitor, and a collector configured to output an amplified radio-frequency signal, a second transistor having a base connected to the reference potential via a second capacitor and configured to receive the second bias via a second resistor, an emitter configured to receive the radio-frequency signal, and a collector connected to a power supply potential via a third inductor and configured to output a radio-frequency output signal, and an impedance circuit having a first end connected to an output section of the second bias circuit and configured to apply an alternating-current signal to a path extending from the second bias circuit.