Copper wire interface circuit

A copper wire interface circuit, comprising:

• a current output amplifier, a port impedance component, a high-pass filter, and an echo cancellation module, wherein:
• one end of the current output amplifier is connected to the port impedance component, another end of the current output amplifier is connected to a transmit end, the current output amplifier is configured to amplify a to-be-transmitted signal, and output of the current output amplifier has a high impedance characteristic;
• the port impedance component is further connected to the high-pass filter, and an impedance, after under-going impedance transformation performed by the high-pass filter, of the port impedance component is used for performing impedance matching with equivalent impedance of a cable and a load;
• one end of the high-pass filter is connected to the port impedance component, another end of the high-pass filter is connected to the cable, and the high-pass filter is configured to filter the to-be-transmitted signal or a received signal and perform impedance transformation on the port impedance component and
• one end of the echo cancellation module is connected to the port impedance component, another end of the echo cancellation module is connected to a receive end, and the echo cancellation module is configured to perform sampling processing on the received signal and is further configured to perform cancellation processing on the to-be-transmitted signal.