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.