@techreport{oai:ipsj.ixsq.nii.ac.jp:00146306,
 author = {森山, 健 and 酒井, 渉 and 金古, 亮平 and 窪田, 和人 and 山添, 雅彦 and Tatsuru, Moriyama and Wataru, Sakai and Ryohei, Kaneko and Kazuto, Kubota and MasahikoYamazoe},
 issue = {5},
 month = {Nov},
 note = {負荷変動時の送信機保護を可能とし，高品質かつ高効率な PSM(Pulse Step Modulation) 変調方式を用いた直交合成方式中波 AM 送信機を考案・実現させた．本機は負荷変動 （VSWR） に対し負荷電力の供給を制御することで増幅デバイスの電力損失を低減し，送信機の破損を防いでいる．電力増幅器 （PA：PowerAmplifier） と PSM モジュールのデバイスにシリコンカーバイド （SiC） パワー MOSFET を使用し，PA 出力電力効率 （PA ドレーン損失と PA 出力回路による損失を含む） 93.6％の高い効率を確認した．変調特性は S/N74.4dB，ひずみ率 5％以下を実現した．, NHK and NHK-ITEC developed an orthogonal combined type Medium-wave AM transmitter with an output of 100W using Pulse Step Modulation (PSM). This transmitter employs mechanisms to optimize the output power according to the VSWR, and to reduce the loss of amplification devices to avoid their damage. Digital processed PSM method, that can achieve high sound quality, was introduced, and SiC power MOSFETs were used in the modulation and amplification sections. The output power efficiency of 93.6% at a single 50 W power amplifier and S/N of over 74.4 dB and distortion factor of less than 5% were achieved with two parallel-operated 50W power amplifiers.},
 title = {PSM変調を用いた直交合成方式中波AM送信機の開発},
 year = {2015}
}