Patent ID: 8018446

Claim:
A differential signaling system, comprising: a pair of differential signal lines having a transmitting end and a receiving end; and a termination resistor and an active impedance compensator connected in parallel between the pair of differential signal lines at the receiving end, wherein the active impedance compensator includes a plurality of impedance adjustment circuits connected in parallel between the pair of differential signal lines, wherein each impedance adjustment circuit includes: a sequence of a first resistor, a switch, and a second resistor connected in series between a first power source line and a second power source line, a first capacitor having a first electrode connected to a node between the first resistor and the switch, and having a second electrode connected to one of the pair of differential signal lines, and a second capacitor having a first electrode connected to a node between the second resistor and the switch, and having a second electrode connected to the other of the pair of differential signal lines.