| 摘要 |
PURPOSE:To constitute a miniaturized noise suppression circuit by connecting a passive capacity circuit, composed of a small-capacity capacitor and a passive circuit between the going and returning lines of a communication circuit, in the noise suppression circuit for a data communication circuit. CONSTITUTION:Passive capacity circuit A is arranged by connecting between the going and returning lines between a terminal equipment and polarity change-over switch SW of communication signal current supply CS. This passive capacity circuit A is constituted by arranging in parallel the Miller integrator composed of diode D1, transistor TR1, resistance RE1, diode D2, capacitor C0 and resistance RB, and that of diode D3, TrTR2, resistance RE2, diode D4, capacitor C0 and resistance RB. Consequently, a miniaturized noise suppressor, made equivalent to a capacitor tens times the conventional one composed of a conventional capacitor is enable to obtain sufficient noise suppression effect. |
