Parallel hybrid circuit

A parallel hybrid circuit, comprising:

• a transformer, comprising:
• a first side, comprising a transmitting coil group and a receiving coil group, wherein the transmitting coil group comprises at least one transmitting coil respectively having a transmitting coil number cnt, wherein the receiving coil group comprises at least one receiving coil respectively having a receiving coil number cnr
• a second side comprising at least one transceiving coil having a transceiving coil number cntr;
• wherein the transformer receives a transmitting signal from at least one transmitting line and couples the transmitting signal from the first side to the second side via a first turn ratio to generate a transformed transmitting signal to at least one transceiving line, and receives a receiving signal from the transceiving line and couples the receiving signal from the second side to the first side via a second turn ratio to generate a transformed receiving signal to at least one receiving line;
• where the first turn ratio is relative to the cnt and the cntr, and the second turn ratio is relative to the cntr and the cnr;
• a first matching resistor, coupled with the transformer in parallel;
• a second matching resistor, coupled with the transformer in parallel;
• and
• an echo cancelling circuit coupled between the transmitting line and the receiving line.