Patent ID: 8054123

Claim:
An apparatus comprising: a first differential amplifier differentially amplifying a pulse width modulation signal and an inverted pulse width modulation signal and outputting a first differential amplification voltage and a second differential amplification voltage based on the amplified result; and a second differential amplifier differentially amplifying the first differential amplification voltage and the second differential amplification voltage, and shifting the differential amplification voltages to voltages having an output range between a first voltage and a second voltage based on the amplified result, wherein the first differential amplifier includes: a pair of first differential transistors to which the pulse width modulation signal and the inverted pulse width modulation signal are differentially input; a bias resistor connected between a tail of the pair of first differential transistors and a ground power source; a first inner pressure protective resistor connected between a first output terminal of the pair of first differential transistors and a first node; a second inner pressure protective resistor connected between a second output terminal of the pair of first differential transistors and a second node; a first load transistor connected between the first node and the first boot strap power source, including a gate connected to the second node; and a second load transistor connected between the second node and the first boot strap power source, including a gate connected to the first node.