Patent ID: 6163579
Filing Date: 2000-12-19
Classification: H04B,H04L

Abstract:
A hybrid circuit which couples a broadband modem to a telephone line, said hybrid circuit comprising:a transformer bridge circuit includingi) a first leg comprising a first impedance matching network connected between a first node and a second node;ii) a second leg comprising a first primary winding connected between said first node and a third node;iii) a third leg comprising a second impedance matching network connected between said third node and a fourth node;iv) a fourth leg comprising a second primary winding connected between said second node and said fourth node;a drive amplifier which applies a transmit signal from the modem across said first and fourth nodes;a secondary winding magnetically coupled to said first and second primary windings and electrically coupled to the telephone line; anda receive amplifier which receives a receive signal between said second and third nodes and provides a receive signal indicative thereof.