Patent ID: 8154538

Claim:
A differential signaling system comprising: a first wire and a second wire connected to a sending end and a receiving end as a differential signal line; a termination resistor connected between the first wire and the second wire adjacent to the receiving end; and a programmable compensation circuit connected to the termination resistor in parallel and configured to match an impedance of the first and second wires, wherein the programmable compensation circuit includes: n switches M 1 , M 2 , . . . , Mn for receiving each bit of an input digital control signal through a plurality of gates thereof, n first capacitors C 11 , C 12 , . . . , C 1 n including a first electrode connected to a source electrode of each of the switches, and a second electrode connected to the first wire, and n second capacitors C 21 , C 22 , . . . , C 2 n including a first electrode connected to a drain electrode of each of the switches, and a second electrode connected to the second wiring, wherein the resistance of each of the n switches is not included in determining parallel composite impedance of the programmable compensation circuit.