A signal driving device includes a constant current circuit configured to provide a constant current, a first mirror circuit configured to generate a mirror current from the constant current and provide a voltage according to the mirror current of the constant current, a circuit comprising a switch device and configured to provide a driver current, a second mirror circuit configured to generate a mirror current of the driver current and output a voltage that includes a voltage drop caused when the mirror current of the driver current flows through a replica switch device, and a differential amplifier configured to receive the voltage from the first mirror circuit and the voltage from the second mirror circuit to provide a biased voltage for the bias circuit and thereby induce the driver current.