公开(公告)号：US20240322758A1

公开(公告)日：2024-09-26

申请号：US18668341

申请日：2024-05-20

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Yuuma NOGUCHI ,  Kiichiro TAKENAKA ,  Tomohide ARAMATA ,  Takeshi KOGURE ,  Takaya WADA

IPC: H03F1/02 ,  H03F3/24

CPC classification number: H03F1/0233 ,  H03F3/245 ,  H03F2200/105 ,  H03F2200/451

Abstract: A power amplifier circuit includes a power amplifier configured to amplify radio-frequency signal, a supply voltage terminal coupled to the power amplifier, and a bypass capacitor coupled between ground and a supply voltage path connecting the supply voltage terminal to the power amplifier. A supply voltage (VDET) is configured to be supplied to the power amplifier through the supply voltage terminal, and the supply voltage (VDET) is configured to vary across multiple discrete voltage levels within a single frame of radio-frequency signals. The first bypass capacitor has an electrostatic capacity equal to or higher than a specific value that is determined to cause the power amplifier circuit with the first supply voltage to have a higher efficiency than a threshold efficiency. In some exemplary embodiments, the bypass capacitor has an electrostatic capacity equal to or higher than 1.4 nanofarads.

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：US20240405723A1

公开(公告)日：2024-12-05

申请号：US18800331

申请日：2024-08-12

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Yuuma NOGUCHI ,  Kiichiro TAKENAKA ,  Takeshi KOGURE

IPC: H03F1/02 ,  H03F3/04

Abstract: An amplification system configured to perform SPT and includes a DC/DC converter configured to output a power supply voltage Vcc1, a DC/DC converter configured to output a power supply voltage Vcc2, power amplifiers, and a switch configured to, in a first mode, selectively perform switching between a connection of the DC/DC converter and the power amplifier and a connection of the DC/DC converter and the power amplifier and, in a second mode, connect the DC/DC converter and the power amplifier and connect the DC/DC converter and the power amplifier.

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.