@techreport{oai:ipsj.ixsq.nii.ac.jp:00213768,
 author = {田中, 聡 and Satoshi, Tanaka},
 issue = {7},
 month = {Nov},
 note = {PA (power amplifier) の設計で歪みの代表的な指標である ACLR (adjacent channel leakage power ratio) を確認 する場合，PA の AM-AM/PM 特性を算出した後，変調信号の時系列データを入力し，出力をフーリエ解析する方法がよく知られている．5G (第 5 世代) 携帯電話では変調信号として QPSK (quadrature phase shift keying) 変調のみならず，16QAM (quadrature amplitude modulation)，64QAM，256QAM と多値化が進んでいる．更に変調帯域も 100MHz を超える場合もあり，時系列データ量が増加し，演算時間の増加が課題となる．演算時間の短縮に向け，変調信号の確率密度と PA の AM (amplitude modulation)-AM/PM(phase modulation) 特性から PA で発生する歪み総量を算出し，ACLR の代替とする方法を検討する．本報告では多くのビヘイビアモデルか提案されていて，検討が容易な PA の AM-AM 特性に注目し，2 トーン信号での IMD3 (inter modulation distortion 3) に関して，フーリエ解析した場合と確率密度から求めた場合を比較した．比較結果として非線形性がある程度小さい場合に，両者は良く一致することを確認した．, When confirming the ACLR (adjacent channel leakage power ratio), which are representative indicators of distortion in the design of PA (power amplifier), it is well known how to calculate the AM-AM/PM characteristics of PA, input time series data of modulated signals, and analyze the output by Fourier analysis. In 5G (5th generation) mobile phones, not only QPSK (quadrature phase shift keying) modulation but also 16QAM (quadrature modulation), 64QAM, and 256QAM are becoming more multivalued as modulation signals. In addition, the modulation band may exceed 100 MHz, and the amount of time series data increases, and the increase in calculation time becomes a problem. In order to shorten the calculation time, it is considered that calculating the total amount of distortion generated by PA from the probability density of the modulation signal and the AM (amplitude modulation)-AM/PM (phase modulation) characteristics of PA. In this paper, we first focus on the AM-AM characteristics of PA, and compare the Fourier analysis of the IMD3 (inter modulation distortion 3) when two-tone signals are input and those obtained from probability density. As a result, it was confirmed that the two agree well when the nonlinearity is somewhat small.},
 title = {入力信号の確率密度とAM-AM特性を用いたRF電力増幅器の歪み解析},
 year = {2021}
}