Patent ID: 6754338
Filing Date: 2004-06-22
Classification: H04B

Abstract:
A bidirectional equalizer arrangement for cancelling, in a filter, the effect of residual capacitive and/or residual resistive loss associated with said filter, said arrangement comprising:a first terminal and a second terminal, configured to connect the bidirectional equalizer arrangement to the filter; a transformer, having a primary winding and a secondary winding; a differential amplifier, having a first input coupled to said first terminal, having a second input coupled to said second terminal, and whose output is operatively coupled to the primary winding of said transformer, thereby producing in said transformer's secondary winding a voltage of predetermined magnitude and polarity, a positive feedback circuit coupled to said first terminal and said second terminal, said feedback circuit including: said secondary winding; and a capacitance of predetermined value and/or resistance of predetermined value, wherein said secondary winding is coupled to said first terminal and said second terminal via the capacitance and/or resistance, and wherein said positive feedback circuit produces a feedback current of opposite polarity and equal magnitude to that produced by the residual capacitive and/or residual resistive loss, to substantially cancel the effect of said residual capacitive and/or residual resistive loss of said filter when said filter is operatively coupled to said first terminal and said second terminal of said equalizer arrangement.