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    • 12. 发明公开
    • Circuit for generating a pulse-shaped signal for a communication line
    • Schaltung zum Erzeugen einesimpulsförmigenSignalsfüreineNachrichtenübertragungsstrecke
    • EP1416632A1
    • 2004-05-06
    • EP02292729.7
    • 2002-10-31
    • Motorola Inc.
    • Sicard, Thierry
    • H03K4/02
    • H04L25/0286H03K4/00H03K4/502H03K4/92H04L25/0282H04L25/03834H04L25/03878
    • A transmitter (4) for a controlled-shape switched signal on a communication line (1) comprises a signal generator including a capacitor (19) producing the switched signal to be applied to the line. The capacitor is charged by a charging current (I c ) in response to an input signal (TX) so as to define an edge of the switched signal. The charging means (24, 25) comprises a feedback loop responsive to the capacitor voltage (V O ) for generating a feedback current (I E ) having a continuous magnitude that is a progressive function of the capacitor voltage, the charging current (I c ) being a function of the feedback current (I E ). Resistors (R; R 1 , R 2 ) define an RC circuit with the capacitor (19) enabling the time constant of the feedback current to be controlled.
      Preferably, the feedback loop generates first and second feedback voltages (V H , V L ) one of which is a rising function of the capacitor voltage (V O ) and the other is a falling function of the capacitor voltage (V O ). The feedback current (I E ) is generated first as a function of one of the feedback voltages (V H , V L ) and subsequently as a function of the other of the feedback voltages, so that the rate of change of the feedback current (I E ) increases with time while the one of the feedback voltages is selected and decreases with time while the other of the feedback voltages is selected.
      Preferably, the rate of change of the feedback current (I E ) is a function of the capacitor voltage (V O ) such that the capacitor voltage varies substantially as an exponential function of time, at least for a part of the edge of the switched signal (40, 42, 44, 46) and may be a linear function of time for another part (41, 43, 45) so as to approximate closely a sinusoidal half cycle with few harmonics.
    • 发射器(4)具有反馈电流发生器(24)和充电电流发生器(25),该充电电流发生器(25)包括响应于电容器电压(VO)的反馈回路,用于产生具有连续幅度的反馈电流(IE) 电容电压的功能。 提供给电容器(19)的充电电流是反馈电流的函数。 电容器包括在信号发生器中,该信号发生器还包括响应于电容器两端的电容器电压的信号产生单元(9),用于在通信线路上施加开关信号。 反馈电流发生器和充电电流发生器响应用于向电容器提供充电电流的输入信号(TX),以便限定开关信号的边沿。