| 摘要 |
A bidirectional equalizer arrangement for cancelling the effect of residual capacitance and/or residual resistive loss in a separation filter having a low-pass filter and a high-pass filter. The equalizer comprises a differential amplifier whose input forms the equalizer's connection terminals, and whose output is coupled, via a transformer, to a positive feedback circuit that includes the transformer's secondary winding, a capacitor and a resistor of predetermined values. When the equalizer is operatively coupled to the low-pass filter, the positive feedback circuit produces a feedback current of opposite polarity and equal magnitude to that produced by the residual capacitance and/or the residual resistive loss, thereby substantially cancelling their effect. The equalizer may be advantageously used with an ADSL/POTS separation filter. <IMAGE> |
