Patent ID: 8466718

Claim:
A semiconductor device comprising: an output driver that is based on a scalable low-voltage signaling technology and capable of making automatic adjustments of output characteristics in accordance with the magnitude of a first reference current; and a driver replica that is a duplicate of the output driver; wherein the driver replica adjusts the magnitude of the first reference current in accordance with the difference between the output thereof and a reference voltage and outputs adjusted current to the output driver; wherein the output driver includes: an SLVS output driver; and a pre-driver that is disposed immediately before the SLVS output driver, wherein the driver replica includes: an SLVS output driver replica, which is a duplicate of the SLVS output driver; and a pre-driver replica, which is a duplicate of the pre-driver and disposed immediately before the SLVS output driver replica, wherein the SLVS output driver replica includes a resistor having the same impedance as a transmission path to which the SLVS output driver is coupled and as a terminating resistor placed at an end of the transmission path, and wherein the pre-driver replica includes: a comparator circuit, which outputs the difference between the output of the SLVS output driver replica and the reference voltage; and a current mirror circuit, which generates the first reference current to be supplied to the pre-driver as a drive current of the pre-driver and a second reference current that has a magnitude corresponding to the output of the comparator circuit and is to be supplied to the SLVS output driver replica.