Patent ID: 7545164

Claim:
An output driver for generating an output signal, which is based on a combination of a main signal and an auxiliary signal, to a transmission line, the output driver comprising: a main driving circuit for generating the main signal based on a received data signal to the transmission line at a main impedance; an auxiliary driving circuit for emphasizing the output signal in an initial stage of the generation of the main signal to the transmission line, the auxiliary driving circuit generating the auxiliary signal based on the data signal to the transmission line at an auxiliary impedance; and a mode register set for generating an impedance control signal group and a driving width control signal group; wherein the auxiliary impedance can be controlled using the impedance control signal group such that during pre-emphasis an output impedance, comprising the main impedance and auxiliary impedance, matches a transmission impedance of the transmission line and a reception impedance of a reception system; and wherein a driving width of the auxiliary signal is controlled by the driving width control signal group such that an emphasis width of the output signal is controlled.