公开(公告)号：US12273078B2

公开(公告)日：2025-04-08

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：US11128271B2

公开(公告)日：2021-09-21

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 ,  H04B1/04

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：US20250070718A1

公开(公告)日：2025-02-27

申请号：US18943524

申请日：2024-11-11

Applicant: Murata Manufacturing Co., Ltd.

Inventor： John HOVERSTEN ,  David Perreault ,  Yevgeniy Tkachenko ,  Takeshi Kogure ,  Yuuki Fukuda ,  Toshiki Matsui ,  Yuuma Noguchi ,  Kiichiro Takenaka

IPC: H03F1/02 ,  H03F3/213

Abstract: An amplifier circuit is provided for amplifying a radio frequency signal within one frame of a radio frequency signal by using multiple discrete voltages supplied from the tracker circuit. The amplifier circuit includes a power amplifier and an RC series circuit including a resistor and a capacitor that are connected in series between the ground and a voltage supply path between the tracker circuit and the power amplifier.