Ringing suppression circuit

A ringing suppression circuit provided at one or more nodes, each node having a communication circuit executing communication with another node by transmitting a differential signal through a pair of communication lines connected to the nodes, the ringing suppression circuit comprising:

• a suppression circuit configured to execute a suppression operation for suppressing ringing in the differential signal;
• an operation mode controller configured to set an operation mode of the suppression circuit to one of:
• a normal operation mode, which enables the suppression circuit to execute the suppression operation in response to detecting a change in a level of the differential signal;
• and
• a permanent off mode, which disables the suppression circuit to execute the suppression operation on a steady basis;
• and
• an impedance detector configured to detect a value of a line impedance as an impedance between the pair of communication lines, and output a selection signal to select one of:
• the permanent off mode as the operation mode of the suppression circuit in response to the detected value being smaller than or equal to a predetermined first threshold value;
• and
• the normal operation mode as the operation mode of the suppression circuit in response to the detected value being larger than the predetermined first threshold value,
• wherein the operation mode controller sets the operation mode of the suppression circuit based on the selection signal output from the impedance detector.

A ringing suppression circuit provided at one or more nodes, each node having a communication circuit executing communication with another node by transmitting a differential signal through a pair of communication lines connected to the nodes, the ringing suppression circuit comprising:

• a suppression circuit configured to execute a suppression operation for suppressing ringing in the differential signal;
• an operation mode controller configured to set an operation mode of the suppression circuit to one of:
• a normal operation mode, which enables the suppression circuit to execute the suppression operation in response to detecting a change in a level of the differential signal;
• and
• a permanent off mode, which disables the suppression circuit to execute the suppression operation on a steady basis;
• and
• an impedance detector configured to detect a value of a line impedance as an impedance between the pair of communication lines, and output a selection signal to select one of:
• the permanent on mode as the operation mode of the suppression circuit in response to the detected value being smaller than or equal to a predetermined second threshold value, and
• the normal operation mode as the operation mode of the suppression circuit in response to the detected value being larger than the predetermined second threshold value, and
• wherein the operation mode controller sets the operation mode of the suppression circuit based on the selection signal output from the impedance detector.