DIFFERENTIAL TRANSMISSION CIRCUIT

• Main Authors: TANAKA MAKOTO, ICHIKAWA KOJI, ISHIHARA NOBORU, ITO HIROYUKI, TSUDA TAKEHIRO, OGURI YASUNORI, EKI KAZUYA, TAKAGI TATSUNORI, OIKAWA NAOYA
• Format: Patent
• Language: English; Japanese
• Published: 20.08.2015
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION

PROBLEM TO BE SOLVED: To suppress common mode noise caused by the asymmetry of the amplitude of a common-mode voltage between two signal transmission paths.SOLUTION: A differential transmission circuit 100 comprises: a stepped wave generating circuit 3a that is connected to a signal transmission path VH and drives the signal transmission path VH; a stepped wave generating circuit 3b that is connected to a signal transmission path VL and drives the signal transmission path VL; a potential output circuit 41 that outputs the intermediate potential between the signal transmission path VH and the signal transmission path VL; and an inverse amplifier 42 that inverts the polarity of the intermediate potential outputted from the potential output circuit 41 and gives the result to the midpoint 6 of the terminal resistance between the signal transmission path VH and the signal transmission path VL. 【課題】２本の信号伝送路間での同相電圧の振幅の非対称性によって生じるコモンモードノイズを抑制することを可能にする。【解決手段】差動伝送回路１００であって、信号伝送路ＶＨに接続されて、信号伝送路ＶＨを駆動する階段波発生回路３ａと、信号伝送路ＶＬに接続されて、信号伝送路ＶＬを駆動する階段波発生回路３ｂと、信号伝送路ＶＨの電位と信号伝送路ＶＬの電位との中間電位を出力する電位出力回路４１と、電位出力回路４１から出力される中間電位の極性を反転させて、信号伝送路ＶＨと信号伝送路ＶＬとの終端抵抗の中点６に与える反転増幅器４２とを備える。【選択図】図１